Provided in the invention is a multifunctional ammeter comprising a front cover, an ammeter body, a rear cover, and a printing identification system. The front cover and the rear cover are installed in a coordination mode; and the ammeter body is installed inside the front cover and the rear cover. A pin type bill printer and a fingerprint scanning device are integrated on the front cover and are controlled by a printing identification system. A lower positioning groove and conductive copper cylinders are arranged at the rear cover; and when the rear cover and the ammeter body are installed in a coordination mode, the lower positioning groove and the conductive copper cylinders can be connected with buses in a coordination mode. The multifunctional ammeter has the following beneficial effects of convenient replacement, compact structures, easy reading, and electricity stealing prevention.