The invention discloses a cogeneration unit hot water supply water mixing and temperature equalizing system. The system comprises a plurality of heat network head stations, a water mixing and temperature equalizing device and a control unit, wherein a plurality of water inlets and a plurality of water outlets are formed in the water mixing and temperature equalizing device; each heat network headstation communicates with a heat supply water return main pipe, and is used for exchanging heat with heat supply steam to heat return water and convey the return water to the water mixing and temperature equalizing device; and a shell of the water mixing and temperature equalizing device is in a cylindrical shape with a water mixing cavity in the middle part, and is provided with the plurality ofwater inlets and the plurality of water outlets, and the number of the water inlets and the number of the water outlets are the same as the number of the heat network head stations. According to the system, valve banks are arranged on all branch inlet pipelines and branch outlet pipelines, so that the heat network water supply pressure and flow of a water inlet and outlet water mixing device are regulated so as to meet the external heat supply quality; and effective interconnection and mutual backup of all heat supply systems are realized, the heat source backup coefficient of the cogenerationunit is greatly improved, the heat supply safety reliability and operation flexibility of the cogeneration unit are enhanced, and energy conservation and consumption reduction are realized to a certain degree.