The invention relates to a wooden box opening tool. The wooden box opening tool comprises a long-bar-shaped base plate. The front end of the base plate is bent downwards first and then bent backwards, so that a U-shaped bent part which is opened backwards is formed. A support is fixedly arranged at the position, close to the front end, of the top face of the base plate. A rotating rod capable of swinging front and back is hinged to the support. A front locking and positioning mechanism used for limiting backward swinging of the rotating rod is mounted on the top surface of the base plate and located in front of the support. A rear locking and positioning mechanism used for limiting forward swinging of the rotating rod is mounted on the top surface of the base plate and located behind the support. A cushion block is mounted on the bottom face of the rear portion of the base plate. The wooden box opening tool has the advantages of being simple in structure, convenient to operate, capable of saving labor and capable of not damaging the interior of a box body.