A telescopic mechanism of an European plug of a power converter with a grounding pin, including a shell, a push handle arranged on the shell, a plug bush arranged in the shell and movably connected with the push handle, a pin assembly arranged in the shell, a fixed rack arranged on the shell and extending into the plug bush, a movable rack connected with the pin assembly, and a gear arranged on the plug bush and meshed with the fixed rack and the movable rack respectively. The pin assembly includes two pins; two ground conductors are arranged on the plug bush, the two pins and the two ground conductors are combined to form a hybrid grounding plug, and an additional contact sleeve is provided on the hybrid grounding plug for a grounding pin of a French plug.