The present application discloses a waterproof bait box, including: a box body provided with an opening at a top; a cover body rotatably connected with one side of the box body and covering the opening; and a locking piece including a connecting piece and a locking plate, wherein one side of the connecting piece is rotatably connected with one side of the locking plate; the other side of the connecting piece is rotatably connected with the box body; the other side of the locking plate is capable of being connected with the cover body in a buckling manner; and when the other side of the locking plate is connected with the cover body in the buckling manner, one side of the locking plate and one side of the connecting piece can rotate towards the box body and be buckled to lock the box body and the cover body.