In the process of daily use of smart energy meter, the information of display screen area shows the error of digital symbol information display, and the display of text and symbol information is incomplete. Based on machine vision technology, the character of smart meter display screen is utilized by Halcon software. The information is missing detection. Firstly, the image of the smart meter display area is extracted. After the extracted display area image is histogram equalized, the edge detection is used to remove the meaningless small target in the target area, and the morphology is used to open the operation. The combination of the closed operation and the closed operation performs character information segmentation on the smart meter display screen, and then detects the character information of the smart meter display area, and uses block processing identification according to different types of display area information, and the detection result and the information in the industrial library. The template matching is carried out, and the information missing area is marked. The feasibility of the detection method of the missing information of the smart meter display screen is verified by experimental analysis.