Composite connection type hydraulic knife handle

The invention relates to a composite connection type hydraulic knife handle. The composite connection type hydraulic knife handle comprises a main knife handle body and an elastic thin-wall inner ringarranged in the main knife handle body, wherein a hydraulic oil cavity is arranged between the main knife handle body and the elastic thin-wall inner ring; the elastic thin-wall inner ring is arranged as a barrel thin-wall structure with two thick ends and a thin middle part; and the side outer rings of the two ends of the elastic thin-wall inner ring make contact with the support surfaces of inner holes of the main knife handle body. The main knife handle body and the elastic thin-wall inner ring are fixed in a manner of combining brazed connection and interference fit connection, the effectof stress on the connection performance of the main knife handle body and the elastic thin-wall inner ring is reduced, the joint of the main knife handle body and the elastic thin-wall inner ring isprevented from tear under the high pressure state, and therefore the service life of the hydraulic knife handle is prolonged. Meanwhile, by improving the structure of a piston rod and the structure ofa piston sleeve, the piston sleeve is quickly maintained, the overall sealing performance of a hydraulic access is improved, and the overall strength of the hydraulic knife handle is improved.