A tool head replacement structure includes a body, a tool head, a locking mechanism, where the body is provided with a connecting end, a connecting portion is arranged on the tool head, and the connecting portion is arranged in the connecting end. The locking mechanism includes a locking ring, the locking ring is annularly provided with a plurality of first locking clasps and first locking blocks, and the connecting portion is annularly provided with a plurality of second locking blocks and second locking clasps. The first locking clasp and the second locking clasp are respectively provided with a first locking groove and a second locking groove, the locking ring is provided with an actuating portion, and the locking ring is driven to rotate. The first locking block and the second locking block disengage from the second locking groove and the first locking groove.