The invention relates to automatic demolding and trimming PP plastic part forming equipment and a process. The equipment comprises a forming device which comprises a convex mold mechanism, a concave mold mechanism and a material injection mechanism arranged above the position between the convex mold mechanism and the concave mold mechanism. The equipment also comprises a discharging device arranged on one side of the material injection mechanism and a trimming device arranged on the same side of the convex mold mechanism and the concave mold mechanism. The discharging device comprises a fixingmechanism which adsorbs and fixes leftover materials of a desk plate, an overturning mechanism which drives the fixing mechanism to overturn to be in a flatwise state together with the desk plate anda moving-out mechanism which drives the fixing mechanism to be moved out to reach the trimming device together with the desk plate; the trimming device comprises a push-down mechanism which pushes the desk plate to move downwards vertically and settles the material flash wastes of the desk plate and a cropping mechanism which crops the leftover materials in the reset process of the push-down mechanism. The equipment provided by the invention solves the problems that a plastic desk plate is low in forming and demolding efficiency, the equipment is low in efficiency and wastes labor as a resultof manual operation needed by discharge, the surface of the desk plate is easily damaged and the leftover materials of the desk plate are inconveniently cropped in the discharging process, and the cropping effect is poor and the efficiency is low.