The invention discloses a lubricating system for a hydraulic machine. The lubricating system comprises an installation plate, an oil pump is adhesively connected to the top of the installation plate,an oil sucking pipe is fixedly connected to the bottom of the oil pump, the lower end of the oil sucking pipe is fixedly provided with a filter net, a sucking nozzle is fixedly connected to the bottomof the oil sucking pipe, a control valve is adhesively connected to the right side of the oil pump, the control valve comprises a valve base, a first valve rod, a first valve body, a second valve rod, a second valve body and a sealing sleeve, the right side of the control valve is fixedly connected with a first pipeline and a second pipeline, the first pipeline and the second pipeline are installed on two supporting sleeves, a first carbon steel bent pipe and a second carbon steel bent pipe are adhesively connected to the bottoms of the right ends of the supporting sleeves, a shower pedestalis welded below the first carbon steel bent pipe, and an oil injection nozzle is welded to the right side of the second carbon steel bent pipe. According to the lubricating system for the hydraulic machine, the surface of a shell of the hydraulic machine can be conveniently lubricated, and components inside the shell of the hydraulic machine can be sprayed with oil to be lubricated.