The invention discloses a water-cooling backboard heat dissipating device which comprises a water-cooling backboard. A circulation loop is formed by a cooling water unit, a water pump and the water-cooling backboard through a pipeline. The water-cooling backboard comprises a
heat exchanger and an air-cooling device on one side of the
heat exchanger. After cooling water of the cooling water unit istransferred from a
heat exchanger water inlet
pipe to the heat exchanger for heat exchange, and the cooling water returns to the cooling water unit by a heat exchanger water outlet
pipe. A bypass
pipe is arranged between the heat exchanger water inlet pipe and the heat exchanger water outlet pipe, and a flow regulating device is arranged between the heat exchanger water inlet pipe and the bypasspipe. The invention also a control method of the above water-cooling backboard heat dissipating device. Compared with the prior art, the hot air blown by a
server is directly recirculated and used after being cooled by the backboard, under the
intelligent control of a PLC, the accurate cooling for a
hot object can be realized, the efficiency is high, and the
energy consumption is low. The specialdesign of an air duct is not needed, air flows directly from the back of the
server to the front side, the
airflow organization is simple and reasonable, the design and installation are simple, and the energy saving effect of
airflow transportation is more remarkable.