The utility model provides a fluid pressure type motor adjusting device, includes, adjustment base and motor, and its characterized in that: the adjustment base fix on the floorbar of beam -pumping unit, the adjustment in the base vertical parallel arrangement have the two adjusting lever, its adjusting lever passes through adjusting sleeve and the slide rail support and the horizontal slide track seat A, the B sliding connection that set up of suit in the outside, the motor is located at slide track seat A, B upward, with the motor slider bolt sliding connection who installs at slide track seat A, B ditch inslot, be provided with pneumatic cylinder A, pneumatic cylinder B on the base and be used for locking slide track seat A's locking device in the adjustment. The utility model discloses with portable handlance as power drive hydraulic cylinder piston rod reciprocating motion, the reciprocating motion of piston rod drives horizontal and vertical guiding mechanism shift adjusting all around, can realize convenient laborsaving, safe and reliable, timely quick replacement belt or adjust the belt elasticity, has avoided the condition of frequent shut down, has prolonged motor and belt life, has improved the output of crude oil.