The invention relates to a high-precision dedicated high-voltage module power supply for a mercury lamp, and the power supply comprises a power circuit disposed in a metal mesh box. The power circuit comprises an AC input rectification filter circuit and an AC/DC isolation conversion circuit, and also comprises a lamp current control and output circuit. The AC input rectification filter circuit is connected with the AC input rectification filter circuit and the lamp current control and output circuit. The beneficial effects of the invention are that the high-voltage module power supply employs AC 220V input, and rings convenience to a user for use; the high-voltage module power supply is quick in dynamic response, and is small in electromagnetic interference; the high-voltage module power supply employs self-vibration constant-frequency amplitude modulation control, employs a push-pull drive structure, is larger in output power, and is high in current-stabilizing precision; the high-voltage module power supply has functions of output lamp current modulation and monitoring, and achieves the linear control of the light intensity of the mercury lamp; the high-voltage module power supply employs an integrated design of working and striking high voltages, improves the reliability of a power supply, and prolongs the service life of the mercury lamp; the high-voltage module power supply is compact in structure, is smaller in size than a conventional high-voltage module power supply, and is good in long-term working stability.