A poultry carcass cooling and conveying system comprising: a hollow cylindrical housing having a coolant stored therein; a feeding device composed of a rotating shaft provided in an interior of the housing in a longitudinal direction of the housing, and spiral screw vanes fixedly installed on a periphery of the rotating shaft; a coolant circuit connected to an inlet and an outlet of the housing, and a decontamination unit and a heat exchanger provided in the coolant circuit; a first flushing nozzle provided on an inner wall of the housing to spray wash water toward the feeding device; and a second flushing nozzle provided on the rotating shaft to spray wash water toward the inner wall of the housing, the first flushing nozzle being a diffusion nozzle which is provided in plurality, the second flushing nozzle being an embedded-type nozzle, the body of which is embedded in an outer periphery of the rotating shaft, the poultry carcass cooling and conveying system further comprising a wash water supply unit which supplies wash water to the first flushing nozzles through a piping provided along a partition wall of the housing, and supplies wash water to the second flushing nozzles through a channel formed in an interior of the rotating shaft, charaterized in that the first nozzles are provided at least one in each pitch of the screw vanes, the second flushing nozzle is a diffusion nozzle which is provided in pairs for every pitch of the screw vanes, the paired second flushing nozzles being provided at different positions in an axial direction of the rotating shaft and at mutually opposite positions in a circumferential direction of the rotating shaft respectively. a hollow cylindrical housing having a coolant stored therein; a feeding device composed of a rotating shaft provided in an interior of the housing in a longitudinal direction of the housing, and spiral screw vanes fixedly installed on a periphery of the rotating shaft; a coolant circuit connected to an inlet and an outlet of the housing, and a decontamination unit and a heat exchanger provided in the coolant circuit; a first flushing nozzle provided on an inner wall of the housing to spray wash water toward the feeding device; and a second flushing nozzle provided on the rotating shaft to spray wash water toward the inner wall of the housing, the first flushing nozzle being a diffusion nozzle which is provided in plurality, the second flushing nozzle being an embedded-type nozzle, the body of which is embedded in an outer periphery of the rotating shaft, the poultry carcass cooling and conveying system further comprising a wash water supply unit which supplies wash water to the first flushing nozzles through a piping provided along a partition wall of the housing, and supplies wash water to the second flushing nozzles through a channel formed in an interior of the rotating shaft, charaterized in that the first nozzles are provided at least one in each pitch of the screw vanes, the second flushing nozzle is a diffusion nozzle which is provided in pairs for every pitch of the screw vanes, the paired second flushing nozzles being provided at different positions in an axial direction of the rotating shaft and at mutually opposite positions in a circumferential direction of the rotating shaft respectively.