The invention proposes a multi-functional combined junction box with a meter changing tool for electric energy metering. The multi-functional combined junction box comprises a base, a base cover and the meter changing tool, wherein a current wiring terminal and a voltage wiring terminal are arranged on the base, a plug-in and plug-out meter changing switch is arranged on the current wiring terminal, a pin hole is formed in the meter changing switch, a press-type voltage switch is arranged on the voltage wiring terminal, the base cover is an opened box body, an opening side of the base cover isclosely connected with the base, and a meter changing switch through hole is formed in a bottom surface of the base cover and is arranged opposite to the pin hole. In the multi-functional combined junction box, the meter changing tool is connected with the base cover by arranging the meter changing tool in a plug-in and plug-out mode, a test line is used for stably connecting the meter changing tool and the junction box by a plug-in and plug-out mode, the tool is clamped into the junction box, the established function is achieved by controlling the switch on the tool, the operation process issafe and reliable, and the working efficiency is effectively improved.