The invention discloses a novel cycloid hydraulic motor. A spatial structure and a transmission principle are improved. The novel cycloid hydraulic motor is characterized in that a cycloid gear is made into a left-right shaft neck type, so that the cycloid gear can be fixed on a housing; the cycloid gear is made of 38CrMoAlA alloy structure steel, after tempering treatment, strong nitriding treatment is performed on the tempered steel, and the steel after nitriding treatment is high in wear resistance and fatigue resistance; a gap between the left shaft neck cycloid gear of the cycloid gear and a fixed hole pin disc is used for assembling an end-surface oil distributing valve; an end-surface oil distributing mechanism of the novel cycloid hydraulic motor consists of an oil distributing pin-wheel cycloidal meshing pair, a fixed pin disc mechanism, the end-surface oil distributing valve and the like; and an oil distributing pin wheel consists of a deep groove ball bearing and a cylindrical pin which are uniformly distributed on an involute spline shaft inner sleeve, and is mounted at the joint part of the involute spline shaft inner sleeve and the left end of a left end cap of a hole pin output mechanism.