The invention relates to the technical field of
tree planting, in particular to a pit digging device for
tree planting, which comprises a vehicle body, a guide frame, a lifting plate, a soil taking guide rod, a soil taking spring, a soil collecting frame, a soil collecting cylinder and the like, a guide frame is fixedly connected to the vehicle body, a lifting plate is slidably connected to the guide frame, a spiral
drill rod is rotatably connected to the lifting plate, a main motor used for driving the spiral
drill rod is fixedly connected to the lifting plate, a soil taking guide rod is slidably connected to the lifting plate, a soil collecting frame and a soil collecting box are fixedly connected to the soil taking guide rod, and the soil collecting frame is communicated with the soil collecting box. A soil collecting
barrel is fixedly connected to the soil collecting frame and used for guiding soil so that the spiral
drill rod can lift the soil upwards into the soil collecting frame. According to the device, dug soil can be collected into the soil collecting box, and when a next pit is dug, the backfilling mechanism can backfill the collected soil into a previous pit, so that the backfilling of the previous pit is realized in the pit digging process, the physical labor of workers is reduced, and the
tree planting efficiency is improved.