The invention belongs to the technical field of special power supplies, and discloses a multifunctional high-voltage power supply, which comprises a transformation circuit, a rectifying filter circuit, a safety protection circuit and a detection display circuit, wherein one end of a secondary edge of a set-up transformer (T2) of the transformation circuit is connected with a current meter of the detection display circuit and then is ground, while the other end serves as an alternating current high-voltage output end of the multifunctional high-voltage power supply; and a high-voltage output end of the transformation circuit is connected with a positive electrode of a high-voltage silicon stack (D1) of the rectifying filter circuit and is connected with a negative electrode of a high-voltage silicon stack (D2), the negative electrode of the high-voltage silicon stack (D1) serves as a positive direct current high-voltage output end of the multifunctional high-voltage power supply, and a positive electrode of the high-voltage silicon stack (D2) serves as a negative direct current high-voltage output end of the multifunctional high-voltage power supply. The multifunctional high-voltage power supply is applicable to a high-voltage power supply supplying different types of high-voltage electricity for operating mechanisms or devices.