The invention discloses a plastic pallet multifunctional trimming machine. The cutting mechanism of the plastic pallet multifunctional trimming machine is positioned in the middle of the side part of a machine body, and the machine body comprises a cabinet body, a power device, a transmission device, guide rails, a trolley and a control panel, wherein the cabinet body is inversely placed on the ground, and the longer surface of the cabinet body is enabled to be arranged upwardly to serve as a working surface, the two guide rails are mounted in the length direction of the working surface, the trolley capable of sliding on the guide rails is mounted on the guide tails, an upward limiting plate is fixed at one edge, perpendicular to the guide rails, of the object stage of the trolley, at least two positioning columns of which the positions can be adjusted are arranged on the object stage, the power device and the transmission device are arranged inside the cabinet body, and the transmission device is connected with the power device and the trolley. When the plastic pallet multifunctional trimming machine is in use, a pallet is fixed through the limiting plate and the positioning columns (the pallet is provided with slots), after starting, the trolley carries the pallet to move, moreover, the cutting mechanism starts to work; when bulges on the two sides of the pallet pass through a cutter, the bulges are cut down, time and labor are saved, and the working efficiency and the appearance uniformity are improved greatly.