The invention discloses a high-grade floor polishing and painting device. The high-grade floor polishing and painting device comprises a machine body; conveying cavities are formed in the machine bodyin bilateral symmetry; the two upper side walls and the lower side walls of the two conveying cavities are symmetrically provided with eight rotating wheel cavities in total; and the rear sides of the rotating wheel cavities are provided with transmission cavities. After floors enter the conveying cavities, a hydraulic motor is started, thus, a hydraulic shaft is driven to rotate, then hydraulicoil in a hydraulic cavity is squeezed into a motor cavity through a hydraulic groove, a grinding shaft is pushed move, therefore, the polishing thickness of the floors by polishing pieces is determined. A painting cavity is formed between the two conveying cavities, a paint storage cavity is formed in the upper side of the painting cavity, drying cavities are formed in the upper side wall and thelower side wall of the conveying cavity on the right side, compared with the traditional mode that drying boxes are arranged up and down separately, the device adopts rotary drying, a drying box is controlled by a helical gear combination, and thus drying is more uniform.