The invention discloses a hydraulic motor and a production technology thereof. The hydraulic motor comprises an installing flange, installing positioning holes, a key groove, an output shaft, a sealing ring, fixing mechanisms, an oil inlet, an oil outlet, an oil distributing box, a filtering box, an installing partition plate, a first large-hole-diameter filtering plate, a first small-hole-diameter filtering plate, a second small-hole-diameter filtering plate, a second large-hole-diameter filtering plate, an oil outlet pipe, an oil inlet pipe, a shell, a sealing sleeve, a stator and rotor pair, clamping plates, a rotor lining plate, fixing pins, a partition disc and an end cover; the sealing sleeve is installed in the shell through buckles; the rotor lining plate is installed on one side of the sealing sleeve through bolts; the clamping plates are installed on the two sides of the rotor lining plate through bolts, and the stator and rotor pair is arranged between the clamping plates; the output shaft is installed on one side of the stator and rotor pair through bolts; and the key groove is formed in one side of the output shaft. The hydraulic motor is convenient to install, can beconnected firmly and has a good sealing effect, and the using safety is greatly improved.