The utility model relates to a novel long stroke hydraulic pumping unit, including main frame, energy storage ware, mend oily frame, base, move the band pulley, polished rod eye, belt, combination pneumatic cylinder, decide band pulley and hydraulic control system, install the main frame on the base and mend oily frame, the main frame with mend oily frame and weld and is in the same place, main frame internally mounted has the combination pneumatic cylinder, it has an energy storage ware to mend oily frame internally mounted, hydraulic cylinder piston rod with move the band pulley and be connected, the belt is walked around and is decided the band pulley and move the band pulley, one end is fixed in the main frame top, one end is connected with the polished rod eye, the beneficial effects of the utility model are that: simple structure is compact, installs the energy storage ware in back of the body well head one side, can offset suspension point load to the overturning moment of beam -pumping unit, and the security performance is high, adopts the type of belt drive of belt and band pulley group, in reduction beam -pumping unit height, can realize the requirement of long stroke, has certain market competition.