The invention relates to the field of wafer processing, and discloses a quartz wafer corroding device. The quartz wafer corroding device comprises a cam and a rotating shaft coaxially connected with the cam, a first cavity and a second cavity are arranged on one side of the big end of the interior of the cam, corroding liquid is contained in the first cavity, and cleaning liquid is contained in the second cavity; a first block piece is arranged at an outlet of the first cavity, a second block piece is arranged at an outlet of the second cavity, two grooves are formed in the side walls of the cam respectively, sliding arms are arranged in the grooves, one side wall of each sliding arm is fixedly connected with the side wall of the corresponding block piece, and the other side wall of each sliding arm is connected with the side wall of the corresponding groove through a compression spring; the quartz wafer corroding device further comprises a first convex block and a second convex block which are located on the two sides of the cam respectively, a conveying device is arranged under the cam, a first gear is connected to the lower end of the rotating shaft, and a power device is connected to the first gear. The quartz wafer corroding device can control the corrosion degree of a wafer, conduct corroding and cleaning simultaneously and save time and labor.