Liquid cooling server cluster and data center liquid cooling system

The invention provides a liquid cooling server cluster and a data center liquid cooling system, and relates to the technical field of data center cooling, and the liquid cooling server cluster comprises a cabinet body and a plurality of servers; the cabinet body comprises a first cavity, a first plate body is arranged in the first cavity, and a plurality of first through holes are formed in the first plate body; in the vertical direction, the first cavity is divided into a buffer cavity and an immersion cavity which are independent from each other through a first plate body, and the immersion cavity is located above the buffer cavity; the plurality of servers are arranged in the immersion cavity; the server comprises shells, second through holes are formed in the bottom surfaces of the shells, and the bottom surfaces of the multiple shells correspond to the multiple first through holes one to one; a second plate body is arranged in the immersion cavity, the shell penetrates through the second plate body, and