The invention relates to the technical field of fuel injection pumps, in particular to a cleaning device of a fuel injection pump connector. The cleaning device comprises a connector body, a fuel inlet and a fuel outlet. The fuel inlet is located in the upper portion of the connector body, the fuel outlet is located in the lower portion of the connector body, and the connector body is formed by a sleeve and a fuel pipe. A bush is a cylindrical elastomer and is arranged in the fuel pipe and attached to the inner wall of the fuel pipe. The sleeve is inserted in the top of the fuel pipe and is in threaded connection with the fuel pipe. The bottom of the sleeve is inserted in a cavity on the top of the bush. According to the cleaning device, the bush, namely the cylindrical elastomer, is arranged in the fuel pipe, the sleeve is used for sealing the bush to enable the bush to be tightly attached to the inner wall of the fuel pipe, when fuel enters the fuel pipe, the contact between the fuel and the inner wall of the fuel pipe can be avoided, the bush can adsorb impurities so that cleanliness of the fuel can be improved, breakdowns caused by the impurities of the fuel are avoided, and working reliability of the fuel injection pump is improved.