Visual inspection device

The utility model relates to a visual inspection device which comprises an electric control cabinet, a workbench is arranged on the electric control cabinet, a plurality of sliding rails which are arranged in parallel are installed at the top end of the workbench, a transmission mechanism is arranged between the two sliding rails and comprises a driving roller and a driven roller, and a transmission belt is installed between the driving roller and the driven roller. A center shaft of the driving roller is connected with the output end of the servo motor, a center shaft of the driven roller is installed on the workbench through a driven shaft installation base, a material bearing frame used for containing workpieces is arranged at the top end of the sliding rail, and a sliding block corresponding to the sliding rail is installed at the bottom end of the material bearing frame. The servo motor drives the material bearing frame to do linear motion along the sliding rail through the transmission belt, a protectiv