The utility model discloses a retarber drive controller heat exchanger that looses, including loosing the heat exchanger body, a plurality of radiating grooves have been seted up to the trailing flank of the heat exchanger body that looses, have the fixed strip through bolt fixed mounting around the trailing flank, and the both ends of fixed strip have all seted up the mounting hole, have placed the bolt in the mounting hole, and the trailing flank passes through the bolt fastening in the rear end of loosing the heat exchanger body, loosing, fixed mounting has a temperature sensor on the inner chamber left side wall of heat exchanger body, and fixed mounting has the 2nd temperature sensor on the inner chamber right side wall of the heat exchanger body that looses, be provided with in the heat exchanger body that looses first heat dissipation fan with the second heat dissipation fan. This retarber drive controller heat exchanger that looses simple structure, degree of automation is high, through distributing thermal temperature in a temperature sensor and the 2nd temperature sensor real -time detection eddy current retarder controller internal electronic element working process to cooperation singlechip controller and first heat dissipation fan pass through the radiating groove with second heat dissipation fan with the heat discharges, has very high practicality and popularization nature.