The invention discloses a fan tower tube cooling device which comprises an air feed unit and an air exhaust unit which are fixed on a tower tube access door. The air feed unit and the air exhaust unit are both connected with an electric control cabinet and a temperature control switch. The temperature control switch controls the starting and stopping of the air feed unit and the air exhaust unit. An air inlet tube of the air feed unit and an air outlet tube of the air exhaust unit both stretch out of the tower tube access door. The fan tower tube cooling device is reasonable in structure and simple to operate, the problem of cooling at the bottom of a fan tower can be greatly eliminated and the operating efficiency of the fan can be improved. The fan tower cooling device satisfies the requirement of long-time normal operations of the fan and the control cabinet while the structure of the fan tower tube remains unchanged.