The invention discloses a high voltage capacitor-based energy taking power supply arranged in a ZW20 switch, which comprises a shell, a high-voltage input terminal, a first output plug and a second output plug, wherein one end of the high-voltage input terminal is fixedly installed on one side of the shell through a thread, the first output plug and the second output plug are fixedly connected tothe inner wall of the shell through snap spring type terminals, one end of the first output plug and one end of the second output plug both penetrate through the shell and extend out of the shell, anda high-voltage energy taking capacitor and a low-voltage energy taking capacitor are fixedly installed on the inner wall of the shell through arc-shaped fixing rings from top to bottom. The inventionrelates to the technical field of electrical equipment. According to the high voltage capacitor-based energy taking power supply arranged in the ZW20 switch, the 10kV plateau type energy taking capacitor is simple in structure, compact in installation, stable and reliable in performance, good in use effect, capable of being installed easily, conveniently and rapidly, long in service life and capable of effectively solving the power supply problem of 10kV overhead power distribution lines.