The invention discloses an electric energy meter liquid crystal device fault detection method. The method comprises the steps that working images of a liquid crystal device are collected through an image collecting device when an electric energy meter is energized; the liquid crystal working images are transmitted into an image processor; characteristic signals of a binary image and the liquid crystal working images are obtained; finally, the characteristic signals are compared with electric energy meter liquid crystal device working standard characteristic signals stored in a database system to obtain a difference value, and whether a fault exists in the liquid crystal device or not is obtained; according to the method, whether defects exist in electric energy meter liquid crystals or not can be identified automatically; in this way, manual work of detecting each electric energy meter liquid crystal can be reduced, and the work efficiency is improved. An epitope voltage relay is controlled through communication of upper computer software and an error instrument, and energizing and deenergizing of the electric energy meter is controlled. In the energizing moment of the electric energy meter, liquid crystals can be subjected to point measurement, at this time, shooting is conducted through a camera, comparison is conducted with samples in a standard library by means of the image processing technology, and whether the electric energy meter liquid crystals break down or not is judged.