The invention provides a quick bayonet joint reliable in connection, and convenient and quick to assemble and disassemble. The quick bayonet joint comprises a socket, a plug and a hand-screwing bulkhead assembly. The socket comprises a socket copper core and a socket plastic sleeve. One end of the socket copper core is in the form of a flat conductive connection plate, and the other end of the socket copper core is in the form of a cylinder. The center of the end surface of the cylinder is provided with an axial socket aperture. The bottom of the socket aperture is provided with a central blind screw hole. The other end of the socket plastic sleeve s provided with an annular groove. One end of the socket copper core is in the form of a tubular tail pipe. The other end of the socket copper core is in the form of an outwardly protruding cylindrical copper core head. The copper core head is provided with a small hole, a tapered hole and a large hole, wherein the holes are consecutively arranged. One end of the socket plastic sleeve is in the form of a tubular head part, and the other end of the socket plastic sleeve is in the form of a regular polygonal tail part. The hand-screwing bulkhead assembly is provided with a hand-screwing bulkhead, a hexagonal head bolt, a bolt plastic sleeve, a spring and a conical extrusion support pad sheet. The hand-screwing bulkhead is provided with a boss and the boss is provided with a hexagonal counter bore. The shoulder part of the boss of the hand-screwing bulkhead is provided with a regular and external polygonal inner circular groove. The technical scheme of the invention is applied to large-current quick bayonet joints.