The invention discloses a high-density UPS (Uninterrupted Power Supply)-free energy-saving cloud server box system, which comprises a cabinet box, a heat exchange system and a server cabinet, wherein the server cabinet and the heat exchange system are integrally arranged in the cabinet box. By adopting the server box system, the technical problems of high planning and designing difficulties of a data center machine room, poor installation of the cabinet and a cooling system and poor energy-saving effect can be solved. The high-density UPS-free energy-saving cloud server box system is prefabricated in a factory and can be put into use by only connecting cooling water, a power supply and a network on a field, so that installation is easy, and the planning, designing and construction difficulties of the data center machine room are lowered.