The invention aims to provide a watchdog control method of a infrared touch type elevator system. A control chip, a photosensitive sensor and an embedded main control board of an infrared detection frame device respectively send out monitoring signals to a previous device thereof when special conditions are satisfied so that a roof main control board can judge whether the devices go wrong or not according to detection results of the special monitoring signals and make corresponding emergent action. The watchdog control method of the infrared touch type elevator system has a monitoring range covering the infrared detection frame device, the display screen and the embedded main control board, can prevent passengers from being trapped to cause secondary accidents no matter the devices go wrong in the stop process or the operation process of the elevator and can greatly improve the reliability of the elevator system operated in a touch mode.