The invention discloses the equal energy pulse power supply for numerical control electrical discharge wire-cutting, which consists of a main vibration circuit, a driving circuit, a detection circuit, direct current power supply and a power amplification circuit; wherein, the detection circuit is used in the real time online detection of gap discharge states and the breakdown no-loaded signals isadopted as the delay signals of the main vibration circuit; the pulse width of the processing current of heavy current spark discharge is led to be equal by controlling the on and off time of a firstpower switch tube (T1), thus realizing the equal energy processing; the rough processing and finish processing can be realized by controlling the switching of an alternating current contactor (KM).