A liquid cooling head device includes a base, a cover covering the base, an inlet portion disposed on the base, an outlet portion formed on the cover, and a fluid pump having a housing and a fan blade. The base includes a diversion channel, an opening and a first chamber connected to the diversion channel and the opening. A second chamber is formed between the cover and the base, and connected to the first chamber through the opening. The inlet portion is connected to the first chamber through the diversion channel. The housing covers one surface of the cover, so that a third chamber is collectively defined by the housing and the cover, and connected with the second chamber and the outlet portion. The fan blade is located in the third chamber, and the diversion channel is located between the fan blade and the first chamber.