Abstract: To improve detection efficiency, a study on automatic detection for dental X-ray machines was completed by summarizing quality control standards. The study is based on the DigiDent module, and for high contrast resolution, the algorithm of line pair spacing based on wave crest and trough and the algorithm of angular deviation based on measurement line translation are proposed; for low contrast resolution, the algorithm of half-peak full width combining waveform mean and standard deviation is proposed. The experiments show that the relative deviation of the automatic detection results is controlled within ±5%, which meets the detection requirements.