The invention discloses a multifunctional combined machining pulse power supply. The combined machining pulse power supply is multifunctional. A power supply body is of a three-module structure. A module A is an electrical discharge machining pulse power supply, a module B is an electric arc machining pulse power supply, and a module C is an ultrasonic machining pulse power supply. The three modules are arranged horizontally. A box is of a vertical structure which is horizontally placed. According to the power supply, independent working, mutual conversion and co-working of the module A, the module B and the module C can be achieved, and all the modules form a parallel circuit. The pulse power supplies required by ultrasonic machining, electric discharge machining and electric arc machining are organically and intelligently combined, intelligent control is adopted, and the structure is simple. The combined pulse power supply is driven by different targets according to machining stages and machining ways, the different pulse power supplies are intelligently adopted, and thus the purposes of improving the workpiece machining efficiency and adapting to complex machining ways are achieved.