Feeder outer union protection head belongs to feeder outer union protection technical field, and that aim at solves that prior art exists is with high costs, the problem of troublesome poeration. Theutility model discloses a feeder outer union protection head includes two sealing connection's connector, the connector includes: the solid fixed cylinder of echelonment, the taper structure, a plurality of notches along length direction of taper structure circumference equipartition, taper structure small -size's one end with the solid fixed cylinder small -size's of echelonment one end is connected, and one section of the solid fixed cylinder small -size of echelonment is provided with the external screw thread with taper structure whole outside, and with the solid fixed cylinder small -size's of echelonment one section and the whole outside external screw thread threaded connection's who sets up of taper structure fixed cover, when the large size one end of taper structure was screwed up to fixed cover, the lateral wall of the notch both sides of taper structure was closely laminated.