Sheet pretreatment device

The invention relates to the field of sheet processing, in particular to a sheet pretreatment device which comprises a track shot blasting machine and a conveyor arranged on the track shot blasting machine, a plurality of support assemblies are fixed to the conveyor, and each support assembly comprises a first mounting frame and a second mounting frame which are symmetrically arranged; a strip-shaped plate is fixed between the first mounting frame and the second mounting frame, and a clamping assembly used for clamping a thin plate and a rotating assembly used for rotating the clamped thin plate are arranged between the first mounting frame and the second mounting frame. According to the thin plate pretreatment device, through mutual cooperation of the support assembly, the rotating assembly, the driving assembly and the reset assembly, the two L-shaped frames and the clamped and limited thin plate are driven to rotate, and through rotation of the thin plate, the track shot blasting machine can sequentially c