The utility model provides a multi -functional electric energy meter casing includes upper cover and base, be equipped with opening and two parallel guide rails on the base, article two, parallel guide rail distributes in the opening both sides of base, the upper cover can slide and cover the opening that closes the base along two parallel guide rails simultaneously, be provided with LCD display screen electrical contact terminal on the first guide rail, the interval is provided with page up button on the second guide rail, page down button, the electrical contact terminal of set key and return key, it is fashionable with the opening lid of base when the upper cover, LCD display screen electrical contact terminal is connected LCD display screen loading mouthful LCD display screen that loads and the electricity of the electric energy board in the base that the upper cover set up through the hidden end of walking the line, and page up button, page down button, the button that set key and return key loaded separately can pass through page up button respectively, page down button, the electrical contact terminal and the electric energy board electricity in the base of set key and return key are connected, can effectively prevent the LCD display screen of upper cover, the button is connected by the mistake interrupt with the electric of electric energy board in the base, do benefit to the safe operation of multi -functional electric energy meter.