The invention discloses a rectangular wood chip drying device for cutting tree. The drying device comprises a cuboid drying oven, a groove strip plate, first rolling wheels, T-shaped sliding grooves,T-shaped strip plates, a fixed plate, second rolling wheels, rectangular through holes, an electric push rod, strip-shaped push rods, an iron sheet frame, an electric heating wire, air holes, a metaltube, a suction fan, a motor, a driving round rod, a strip-shaped plate, a conveyor belt, U-shaped strip plates, a driving roller, a rotating door, extruding column blocks, cylindrical grooves and reset springs. According to the rectangular wood chip drying device, the design is reasonable, the function of orderly arranging rectangular wood chips is realized, the drying effect is improved, the structure is compact, the heat can circularly flow in the cuboid drying oven, and the rectangular wood chips can be heated uniformly, the inconvenience of drying on the ground through the sun due to manual carrying is solved, the function of unloading the dried rectangular wood chips at one time is realized, and moving to a centralized storage position is facilitated.