The conveyor belt cleaning system is an add-on apparatus for a grocery store checkout conveyor. The device automatically dispenses a disinfectant liquid on the underside of the belt in a continuous manner. The disinfectant is pumped from an open rectangular reservoir that is the same width as the belt. An electric pump dispenses the disinfectant from at least one spray nozzle at the leading edge of the reservoir. A squeegee is secured at the trailing edge of reservoir removes excess disinfectant which in turn falls back into the reservoir for reuse.