The invention discloses a train catenary height non-contact measuring system based on parallel laser radars, relates to the technical field of laser ranging, and solves the problems that existing ultrasonic radar sensors are easily interfered by other sound waves and are slow in response as compared with the laser radars, and the like. The train catenary height non-contact measuring system a laser radar array, a GPS solar altitude positioning module, a data collecting and processing module, a laser radar alignment angle adjusting structure and a catenary height output module. The train catenary height non-contact measuring system has the advantages that multiple levels of laser radars are used to perform equal-interval circulation scanning and measuring in a parallel pipeline manner, self-adaptive fast positioning can be performed on catenaries with different stagger values, and the limitation that a single laser radar is long in measuring cycle can be avoided; in addition, by the GPS solar altitude positioning module, the alignment angle of the laser radar system is adjusted according to the actual operation direction of a train to prevent the laser radar system from being affected by direct strong sunlight.