The invention discloses a combined power supply of a multifunctional module. The combined power supply comprises a mobile protection box body, a control drawer and a battery drawer, wherein the mobileprotection box body comprises a hinged door box body, universal wheels arranged at the bottom of the hinged door box body and handles arranged on the outer wall surface of the hinged door box body; the control drawer and the battery drawer are detachably arranged in the hinged door box body and are vertically arranged; the control drawer comprises a first drawer body, 220V output modules, a 5V USB output module, 48V direct current output modules, a 48V power switch module, a 220V inversion module, a switch control protection module and a mains supply input module; the battery drawer comprisesa second drawer body, a battery module and a battery protecting plate. The combined power supply of the multifunctional module has the advantages that the emergency reaction time is short, the combined power supply can be easily and manually moved, operation noise is low, no waste gas is exhausted, and the combined power supply is energy-saving, environmentally friendly and the like.