The invention relates to a positioning powdering machine which belongs to the field of fluorescent tube manufacturing devices. The positioning powdering machine comprises a stand, a motor, a cam, a roThe invention relates to a positioning powdering machine which belongs to the field of fluorescent tube manufacturing devices. The positioning powdering machine comprises a stand, a motor, a cam, a roe not easy to control, and the product quality and the production efficiency to be low are solved.be not easy to control, and the product quality and the production efficiency to be low are solved.powdering machine works at two different stations and is liable to be influenced by the overall stability of the machine to cause the lamp to shift, the accuracy of the powdering size of the lamp to bpowdering machine works at two different stations and is liable to be influenced by the overall stability of the machine to cause the lamp to shift, the accuracy of the powdering size of the lamp tor o work at the same station, the power tube is fixed at the corresponding working position and is positioned via a buffer spring push rod and the limiting baffle plate; and the problems that the prior to work at the same station, the power tube is fixed at the corresponding working position and is positioned via a buffer spring push rod and the limiting baffle plate; and the problems that the priotller shutter, a proximity switch, chain wheels, motors with powdering heads, control boxes, air cylinders, transmission shafts, transmission chains, an installing rod and a limiting baffle plate, wherller shutter, a proximity switch, chain wheels, motors with powdering heads, control boxes, air cylinders, transmission shafts, transmission chains, an installing rod and a limiting baffle plate, wherein the motor is installed below the stand, the transmission shafts are respectively installed at both ends of the stand, the chain wheels and the transmission chains are installed at both ends of theein the motor is installed below the stand, the transmission shafts are respectively installed at both ends of the stand, the chain wheels and the transmission chains are installed at both ends of the two transmission shafts; and the installing rod is installed at the middle part of the stand, the motors with the powdering heads are symmetrically installed on the stand at the both ends of the insttwo transmission shafts; and the installing rod is installed at the middle part of the stand, the motors with the powdering heads are symmetrically installed on the stand at the both ends of the installing rod, and the control boxes connected with the two air cylinders are installed at the other sides of the motors with the powdering heads. The invention adopts the motors with the powdering headsalling rod, and the control boxes connected with the two air cylinders are installed at the other sides of the motors with the powdering heads. The invention adopts the motors with the powdering heads