The utility model discloses a bipolarity pulse generator for insulating detect, circuit include an adjustable direct current source UDC, a current -limiting resistor RDC, four charging switch pipe, four ways discharge switch bridge arm, a N high -frequency transformer and N electric capacity energy storage modules, every electric capacity energy storage module, including a single -phase rectifier bridge module, an electric capacity and two switch tubes, IGBT is chooseed for use to the switch tube of circuit, and the form of a plurality of IGBT series connection is chooseed for use to four ways discharge switch bridge arm to every IGBT is reverse parallel diode. The utility model has the advantages of module integration ization degree height, realization series connection rechargeable series -connected cells discharge, adopt high -frequency transformer to step up, be used for the insulating capacitive examination article that detect can realize good square wave output characteristic.