The invention discloses a pool cleaner which is used by cooperating with a water pump. The pool cleaner comprises a shell, a hydraulic driving device and a filter screen; traveling wheels are arrangedon the left side and the right side of the shell, and a pollution suction opening is formed in the bottom of the shell; the filter screen is arranged inside the shell, and the pollution suction opening is covered with the filter screen; a penetrating hole and a through hole are formed in the top of the shell, and the through hole is matched with a nozzle; the spraying direction of the nozzle is the vertical upward direction or the oblique upward direction of the shell; the penetrating hole is matched with a connector, and the hydraulic driving device is arranged inside the shell and comprisesa water inlet pipe connected with the connector, a water outlet pipe communicating with the nozzle and an impeller between the water inlet pipe and the water outlet pipe; and the impeller is in linkage with the travelling wheels through transmission mechanisms. The pool cleaner can move at the pool bottom and on the pool wall of a pool, the pool bottom and the pool wall of the pool are cleaned accordingly, and the cleaning effect of the pool is ensured.