The invention provides a pounding head lubricating oil control device for a hydraulic rock drilling rig. The pounding head lubricating oil control device for the hydraulic rock drilling rig comprises a valve body. A through gas passing channel is formed in the valve body, an inlet a and an outlet b are formed in the two ends of the gas passing channel respectively, a valve body port b communicated with the gas passing channel is formed in the bottom of the valve body, and a gas adjusting rod is arranged in the valve body port b through a gas adjusting nut and a gas adjusting O-shaped ring. A pressure gauge connector communicated with the gas passing channel is arranged on the top of the valve body, and a pressure gauge is arranged on the pressure gauge connector. An oil return port c is further formed in the top of the valve body, and the oil return port c penetrates downwards through the gas passing channel and then forms a counter bore. An oil adjusting sleeve is arranged in the oil return port c through a large O-shaped ring, the bottom of the oil adjusting sleeve is narrowed to form an oil ejecting hole, the top of the oil adjusting sleeve is connected with an oil adjusting core, the oil adjusting core is located and arranged on the valve body through a small locating nut and a large locating nut and is sealed through a small O-shaped sealing ring. The pounding head lubricating oil control device for the hydraulic rock drilling rig has the advantages that a control valve set is compact and exquisite in structure, adjustment and maintenance are simple and convenient to carry out, and operating accuracy is high.