The present disclosure discloses a system and method for measuring safety clearance between the steps and skirt panels of an escalator and positioning hidden dangers and, which improves the working efficiency of the detecting personnel and reduces labor intensity; the system and method of the present disclosure has high accuracy, and eliminates the detection error caused by manual observation and the sense of responsibility, thus helping the detecting personnel to comprehensively detect the hidden dangers to minimize the escalator safety accidents caused by such hidden dangers; and its accurate hidden danger positioning function can help the maintenance personnel to carry out maintenance and adjustment faster. Therefore, the present disclosure is of great significance to the safe operation of the escalator and the personal safety of the passengers, and plays a positive role in promoting the development of the whole quality supervision.