The invention discloses a grinding material continuous and automatic feed device capable of achieving pressure stabilization and flow stabilization. The device comprises a control module, dual spherical high-pressure grinding material tanks, high-pressure water pipelines, low-pressure water pipelines, feeding pipelines, a grinding material water jet pipeline, valves and sensors, wherein the valvesand the sensors are arranged on the pipelines. Valve seats of the dual spherical grinding material tanks are connected with the feeding pipelines, the high-pressure water pipelines and the low-pressure water pipelines. Water pumps are connected with above function devices through high-pressure pipelines, overflow valves, a main proportional flow valve, a bypass proportional flow valve, pneumaticball valves and high-pressure ball valves are arranged in the pipelines, and various functions are achieved through valve on-off combined control. In the device, operation of pure water jet and continuous and automatic grinding material water jet is achieved through system valve on-off combination; meanwhile, through cooperation of the sensors connected to the control module, an energy accumulatorand the flow valves, pressure stabilization and flow stabilization can be achieved, and automatic adjustment of the grinding material concentration and overpressure alarm can be achieved. The deviceis high in safety, simple in operation and capable of being used widely.