The utility model discloses an automatic telescopic fishing rod's locking unlocking device, including the last body of rod, the lower body of rod, go up the body of rod and be equipped with down locking device with the lower body of rod, lower locking device is equipped with loop, and loop's front end is equipped with the lock fork, and the top of lock fork is equipped with the set bar, and loop's the rear end and the last body of rod pass through the articulated fix with plugs of connecting rod, the body of rod is equipped with the slide down, and the slide is equipped with sliding chamber, and the set bar moves along sliding chamber, and the slide front end is connected with the one end of locking plate is articulated, and the front end of locking plate is equipped with stirs the post, and the top that the locking plate is close to the hinged end is equipped with locked groove, locked groove and set bar cooperation, the slide passes through the articulated fix with plugs of the body of rod with the connecting portion of the last body of rod, and the articulated bolt department of the body of rod is equipped with body of rod return spring. The utility model discloses the locked groove that utilizes the locking plate to be equipped with locks the set bar on loop top, and the locking is firm, during the unblock through to the locking plate front end stir the post application of force, make the set bar break away from the locked groove and accomplish the unblock, the locking plate the during unblock is equivalent to a laborsaving lever, the action of unblock is swift, high -efficient.