In-jib chain transmission jib crane

The invention relates to an in-jib chain transmission jib crane, which comprises a vertical post, a jib and a link chain electric hoist, wherein one end of the jib is fixedly arranged on the vertical post; the link chain electric hoist is arranged on the upper part of one end, which is close to the vertical post, of the jib; a chain transmission mechanism is arranged inside the jib and comprises a first chain wheel at one end, which is close to the vertical post, of the jib, a second chain wheel at one end, which is far away from the vertical post, of the jib and a hoisting chain; the first chain wheel and the second chain wheel are rotated in the vertical surface parallel to the axial direction of the jib; the hoisting chain is led out by the link chain electric hoist, pass through the lower part of the first chain wheel, is extended to the second chain wheel along the jib, moves around the upper part of the second chain wheel and then is output; the output end of the hoisting chain is connected with a lifti