This project is a large crawler self-propelled wood chippers, which includes a crawler walking mechanism, a fixed frame, a feeding hopper, a discharging conveying mechanism, a power mechanism and a cutter head assembly. The power mechanism is connected with the cutter head assembly. A chain plate feeding mechanism is set at the bottom of the feeding hopper, and a feeding roller matching with the chain plate feeding mechanism is arranged at the side near the fixed cutter on the upper part of the chain plate feeding mechanism. The chain plate feeding mechanism is used with the feeding roller to realize the feeding. The feeding is stable and efficient, and the scattered materials can also stably feed and crush, which improves the working efficiency and stability of the wood chippers; The discharging conveying mechanism includes a first discharging support, a second discharging bracket, a conveyor belt assembly, an overturning lifting oil cylinder and a folding oil cylinder. The overturning lifting cylinder is installed between the fixed frame and the first discharging bracket to drive the first discharging bracket to lift up or level up, and the folding oil cylinder is arranged between the first discharging support and the second discharging support. It is used to drive the second discharge bracket to rotate, fold or unfold straightly relative to the first discharge bracket. The discharge conveying mechanism adopts a two-stage folding structure, which can fold up during the transition movement, reduce the space occupation, and make the transition movement more flexible and stable.