The present invention relates a dispensing adaptor for one-component polyurethane foam, which is coupled to a valve stem of a polyurethane pressurized container, the dispensing adaptor including: a tubular main adaptor body coupled to the valve stem and introducing polyurethane foam out of the pressurized container; a stem coupling portion formed at one end portion of the adaptor main body and coupled to and communicating with the valve stem; a discharging pipe extended from the other end portion of the adaptor main body; a stationary lever formed integrally with and extended from an outer wall of the adaptor main body; and an extended lever curvedly extended from the stationary lever along a lengthwise direction of the pressurized container, and making the valve stem be inclined to open with respect to an axial direction.
Thus, according to the present invention, since the stationary lever is formed integrally with and extended from the outer wall of the adaptor main body in a direction transverse to the axial direction of the pressurized container, and the extended lever is curvedly extended from the stationary lever along the lengthwise direction of the pressurized container, it is possible to hold the pressurized container and the extended lever with one hand, thereby improving work efficiency and safety. Further, the end portion of the outlet pipe is temporarily blocked when the disposable dispensing adaptor is not in use, so that the disposable dispensing adaptor can be used again.