The utility model belongs to a coal mining devices specifically is a broken hammer hydraulic shock coal -winning machine and hydraulic system thereof. Including the shearer fuselage, the rocking arm and the tractive unit at shearer fuselage both ends, wherein rocking arm one end is connected with the shearer fuselage is articulated, the rocking arm still with increase the hydro -cylinder and be connected, it fixes on the shearer fuselage to increase the hydro -cylinder other end, rocking arm other end hub connection has impact portion, be equipped with 90 bent axles in the impact portion, 90 the bent axle is equipped with two axles, 90 the axial plane of two axles of bent axle is 90, 90 two axles of bent axle are connected with rotatory hydro -cylinder respectively, rotatory hydro -cylinder one end is fixed on the rocking arm. The utility model discloses raw coal production blocking rate can reach more than 70%, compares former drum shearer and can improve 40%, and coal is synthesized the quality and is improved greatly.