Water-cooled heat radiator

The utility model discloses a water-cooled heat radiator, which comprises a heat conductive substrate, multiple radiating fins, a housing, a diffusion cavity and a pump. The radiating fins are arranged on the heat conductive substrate, and multiple gaps exist among the radiating fins. The housing is arranged on the heat conductive substrate, an accommodation space is formed between the housing and the heat conductive substrate, the radiating fins are arranged in the accommodation space, the housing is equipped with a water inlet and a water outlet, and the water outlet is communicated with the accommodation space. The diffusion cavity is arranged in the accommodation space on the radiating fins, and equipped with an opening and a long groove, and the long groove is communicated with the gaps among the radiating fins by transversely through the radiating fins. The pump is arranged on the housing, and is communicated with the water inlet and the diffusion cavity via the opening, and a rotation axis of the pump