Long pulse large power high voltage power supply

The present invention discloses a long pulse large power high voltage power supply. The long pulse large power high voltage power supply is characterized by mainly being composed of a multi-winding isolation transformer and a plurality of AC/DC unit modules each of which has two voltage output gears, wherein the multi-winding isolation transformer adopts a mode that the secondary three phase windings are all unfastened, each secondary single phase winding supplies power to one AC/DC unit module, and the three AC/DC unit modules corresponding to the three secondary single phase windings obtained by unfastening the secondary three phase windings are in synchronous control; there are existed two types of AC/DC unit modules, one type of AC/DC unit module is a switch power supply module of which the output voltage is a fixed value, and the other type of AC/DC unit module is a continuous voltage adjustment module of which the output voltage is continuously adjustable; the output ends of the AC/DC unit modules are connected in series mutually. The long pulse large power high voltage power supply of the present invention enables the number of the unit modules and the input transformer secondary windings to be reduced substantially, can realize the smooth and continuous adjustment of the voltage, is stronger in practicality, higher in efficiency and smaller in size, and is more convenient to maintain.