The utility model provides a dimethyl ether motor fuel cooling device, belongs to the internal -combustion engine field. The utility model discloses a dimethyl ether fuel cooling device, including the cooler body, fuel inlet pipe, fuel outlet pipe, temperature sensor, its characterized in that: have a copper tubing that runs through in that the cooler is internal, the copper tubing dish becomes red copper coil pipe both ends and cooler body wall seal welded, has the refrigeration air conditioner capillary at a red copper coil pipe termination to connect on the air conditioner high -voltage tube through the solenoid valve, at the low -voltage tube of another termination air conditioner of red copper coil pipe, temperature sensor and solenoid valve all are connected to on the controller. The utility model has the advantages that can with among the dimethyl ether fuel supply system absorptive engine and fuel injection pump's heat exchange to the temperature control who makes the dimethyl ether has realized dimethyl ether fuel motor output power's stability within the settlement scope.