Diaphragm valve convenient to overhaul

The utility model discloses a diaphragm valve convenient to overhaul, and relates to the technical field of diaphragm valves. Comprising a diaphragm valve body and a screw rod, and the screw rod is inserted into the diaphragm valve body and is in threaded connection with the diaphragm valve body. According to the diaphragm valve convenient to overhaul, a handle is rotated, a pressurizing piston can be driven to move up and down through a guide rail, a sliding block and other components, the pressurizing piston moves upwards, air on the outer side can be sucked into the pressurizing piston, the pressurizing piston moves downwards, air in a pressurizing tank can be fed into a storage pipe, and the air extrudes a lubricating piston; the lubricating piston moves towards one side of the cavity, a lubricant in the lubricating piston is pushed into the cavity and fed into the lubricating hole through the cavity and the liquid guide hole to lubricate the thread where the screw is connected with the diaphragm valve bo