Roll passing parallelism detection system

The invention provides a roller passing parallelism detection system, and relates to the technical field of detection, the roller passing parallelism detection system comprises a telescopic block, one end of the telescopic block is fixedly connected with a fixed test block, a telescopic mechanism is arranged in the telescopic block, the telescopic mechanism is connected with a sliding test block, and the sliding test block is arranged at one end, away from the fixed test block, of the telescopic block. The fixed test block and the sliding test block are fixedly connected with the first connecting block, the first connecting block connected with the sliding test block is provided with a test mechanism, the upper side and the lower side of the first connecting block are symmetrically provided with contact plates, the contact plates are connected with an adjusting mechanism in the first connecting block, and the contact plates are rotatably provided with contact cylinders. The contact cylinder correspondingly co