Liquid-cooled server

The invention discloses a liquid cooling server. The liquid cooling server comprises a first shell and a second shell, wherein the first shell is accommodated in the second shell; a server main board, a central processing unit (CPU) and a plurality of electronic components are installed in the first shell; the inside of the first shell is filled with silicone oil; a channel which is used for guiding the silicone oil from the first shell into the second shell is formed between the top of the first shell and the top of the second shell, and the channel and the second shell comprise cooling devices which are used for cooling the silicone oil from the first shell; the second shell further comprises a pipeline which is used for enabling the cooled silicone oil to flow back to the first shell; the channel and the pipeline enable the silicone oil to form liquid cooling circulation between the first shell and the second shell. According to the liquid cooling server, the silicone oil is naturally cooled when transferred from the first shell to the second shell, and thereby, complicated cooling processes and steps can be avoided.