The invention provides a liquid cooling radiator, and the liquid cooling radiator comprises a water inlet, a water outlet, a radiator cover plate, a radiator main body and a water cooling flow channel. The water cooling flow channel is arranged on a heat dissipation face of the radiator body and is of a groove structure. The radiator cover plate is connected with a radiating surface of the radiator main body, and a heat conducting surface of the radiator main body is connected with a heating chip. The water cooling flow channel comprises a first flow channel and a second flow channel. A cooling fin area is arranged at a position, corresponding to the heating chip, of the second flow channel, and the cooling fin area comprises a plurality of cooling fins arranged according to a preset rule.The corresponding cooling fin area is arranged according to the distribution position of the heating chip, so that the area proportion of the cooling fin area in the water cooling flow channel is reduced, the flow velocity is reduced to reduce the flow resistance, the heat dissipation efficiency is improved, and the processing and manufacturing difficulty and cost of the liquid cooling radiator are reduced.