Coating pretreatment device

The invention discloses a coating pretreatment device, and belongs to the technical field of coating treatment. Comprising a first bearing unit, a second bearing unit and a driving unit, a worker can adjust the relative position of a limiting mechanism and a supporting mechanism, so that the positions of multiple sets of limiting transverse blocks inserted into an insertion cavity are changed, and due to the fact that the side end face of an attaching vertical strip is attached to the side end face of a box body, in the moving process of a supporting box and an adjusting frame, the supporting box and the adjusting frame are fixed. A certain relative position can be kept between the supporting box and the adjusting frame, through relative adjustment of the limiting transverse block and the inserting cavity, the inserting frame can be inserted into an inner cavity of the through hole for sliding adjustment, and when the supporting box is adjusted in a downward lifting mode, the supporting vertical cylinder can