The utility model relates to a drag for eccentric centralizer of hydraulic pressure for lance mainly includes top connection, main part, piston, spring, first round pin axle, swing supporter, first spacing plug. Establish inside the main part to piston endwise slip, be equipped with on the lower part lateral wall of piston along axial align to grid's a plurality of first tooth, the inside penetrating damping runner of axial that is equipped with of piston. Be equipped with the spring between piston and the main part. The swing supporter is installed in the mounting groove, and swing supporter one end be ARC end, and the other end is the swing end, and ARC end is connected through rotating between first round pin spool and the main part, swings to hold to be located the mounting groove at initial position, swings the outside of main part at operating position, the ARC end of swing supporter is equipped with a plurality of second teeth and the meshing of first tooth. The utility model discloses an eccentric centralizer of hydraulic pressure, it is eccentric in the intraductal production of cover that the messenger drags for the lance, and adaptation junk top of fish and too big this operating mode of sleeve pipe off centering are successfully salvaged the junk. Simple structure, convenient to use.