The invention discloses a misalignment channel autorotation hydraulic rotary piston supercharger. An autorotation hydraulic rotary piston is provided with a piston center through hole, at least two rings of channel units which are in staggered arrangement are adopted at the periphery of the piston center through hole, each ring is provided with multiple channel units, the minimum radial dimension of each outer ring channel unit is less than the maximum radial dimension of each inner ring channel unit, and thus radial misalignment is formed; outer ring channel units and inner ring channel units are in uniform misalignment radiation arrangement on the circumference, and thus circumference misalignment is formed; a lower end cover is provided with a high-pressure water filtering oblique channel and a pressure-relieving water filtering channel which are in symmetrical arrangement; an upper end cover is provided with a pressure-boosting raw water oblique channel and a low-pressure raw water channel which are in symmetrical arrangement, and thus a two-inlet two-outlet oblique channel is formed. By virtue of forces applied to two end surfaces of a hollow rotor by an oblique flow channel, the hollow rotor can rotate freely without being controlled by any components by means of driving and switching a valve by an external electric device and the like, thus flow channel switching can be finished, pressure exchanging can be realized, and accident of any electric device is prevented.