A plumbing trap flushing device for use in association with one of a drain in a sink, an overflow drain in a basin, a drain in a bathtub, an overflow drain in a bathtub or shower and the like is disclosed. The plumbing trap flushing device includes a connector, a conduit and a nozzle. The connector is releasably and operably attachable to a spout of a tap. The conduit is in flow communication with the connector and has an outside diameter and an inside diameter. The outside diameter is dimensioned to fit into the drain, whereby when the conduit is in the drain air and water freely flows around the conduit into the drain. The nozzle is in flow communication with the distal end of the conduit. The nozzle has a nozzle inside diameter less than the inside diameter of the conduit whereby the water exits the nozzle in a stream.