The invention relates to a pulp mincing device, and in particular, relates to a watermelon pulp mincing device. Therefore, the technical problem comprises that provided is the watermelon pulp mincingdevice which not only can automatically cut a mouth of watermelon but also can automatically mince the watermelon pulp in watermelon peel. The technical scheme comprises that the watermelon pulp mincing device includes a base, a bracket, a top plate, a first slide rail, a first slide block, an installation block, a bearing seat, a screw rod, a nut, a guide rod, a guide sleeve, an installation plate and the like. A bracket is arranged on the right side of the top of the base, the top plate is arranged at the upper part of the left side of the bracket, and the first slide rail is embedded at thebottom of the top plate and is slidingly connected with the first slide block. Two first arc-shaped plates are driven to move in opposite directions by pulling the pull rod in the opposite directions, then watermelon is clamped tightly, a handwheel is rotated to drive an annular blade to move upward or downward, a connecting sleeve rod is driven to rotate through a motor, and then the annular blade and a stirring rod are driven to rotate, so that the watermelon surface peel can be cut and the pulp can be minced.