Adjustable liquid storage device and server liquid cooling system

The utility model discloses an adjustable liquid storage device and a server liquid cooling system. The adjustable liquid storage device comprises a deformable tank body, a liquid storage module and a liquid storage module, one end of the deformable tank body is fixedly mounted on the tank body fixing bracket; the moving assembly is installed on the tank body fixing support in a relative movement mode, and the moving assembly is connected with the free end of the deformable tank body; by driving the moving assembly, the free end of the deformable tank body is driven to deform relative to the fixed end, so that the internal capacity of the deformable tank body is adjusted. According to the adjustable liquid storage device, the movement assembly is adopted to control one end of the deformable tank body to carry out deformation movement, adjustment is carried out in real time according to the obtained pressure of a refrigerant medium in a liquid cooling system, the instantaneous pressure change when a cooled obj