The utility model provides an oil injection type water pump and relates to the technical field of water pumps. A bearing seat is fixedly installed on a pump body. A drive shaft is fixedly installed in a center hole of the bearing seat. A bearing gland is fixed to the other end of the bearing seat. Sealing devices are installed in the bearing seat and are tightly close to the bearing gland. The sealing devices are fixed to the bearing seat. The sealing devices comprise the primary sealing device and the secondary sealing device. The primary sealing device is arranged in the secondary sealing device. An inflation device is arranged between the primary sealing device and the secondary primary sealing device. The bottom end of a pipeline is connected with the primary sealing device. The top end of the pipeline is connected with an inflation pump. The sensor is connected with the controller. The controller is connected with the inflation pump. By the adoption of the design, a sealed cavity is formed between the two levels of sealing devices, protective gas can be blown to the sealing device through the inflation device, so that the sealing effect is improved, and the situations that water flow in the water pump flows into a bearing, so that the bearing is abnormally damaged, and the normal work of the water pump is influenced are avoided.