The invention relates to an improved wet type double clutch. The improved wet type double clutch is characterized in that a shaft sleeve sleeves the left side of a main rotary hub; the outer cylindersurface of the shaft sleeve is connected with a piston, and the inner cylinder surface of the shaft sleeve is connected with the periphery of the main rotary hub; the left end of the inner cylinder surface of the shaft sleeve is provided with a conical opening, and the conical opening corresponds to a pressure oil hole which is formed in the main rotary hub; the right hole edge of an outlet of thepressure oil hole is matched with the small end of the conical opening; the right end of the inner cylinder surface of the shaft sleeve is provided with a sealing surface; a sealing ring is arrangedbetween the main rotary hub and the sealing surface of the shaft sleeve. The improved wet type double clutch has the advantages that the whole axial distance of the clutch is reduced, so that the structure is more compact, the layout is convenient for a customer, and the clutch is suitable for more integrated vehicle environments; the axial length is reduced, so that the weight is light, and the current development direction of the integrated vehicle is met; by reducing the axial length, the axial expanding space is widened for parts of transmission toothed shafts and the like, a transmissionwith larger torque can be developed and designed, and the axial length of the existing transmission is not increased; the number of parts is fewer, and the cost is lower.