The three-dimensional closed-loop water system provides and recycles cooling water for the electron beam power cabinet. The closed-loop water system includes water tanks, pumps, filters, heat exchangers, and various auxiliary components. The closed-loop water system for electron beam provided by Sanwei Company is a complete mechanical assembly, including exchangers, field instruments, filters, pump sets, intelligent control valve systems, water tanks, and various other auxiliary components. The closed-loop water system is installed as a complete skid assembly on a base.