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To solve the problem of the transmission shaft of cooling tower fan breaking out in the process of operation, under the premise of analyzing the fracture phenomenon and reason of transmission shaft, a new method for fault detection of transmission shaft is proposed. This method need install the sector sheet on the shaft coupling, setting slot type photoelectric switch as the signal acquisition device and setting PLC as the signal processing device. The characteristic of fast reaction rate and not affected by ambient light of slot type photoelectric switch is used to improve the precision of detection. The effect of enlarging rotation angle for staggered sector sheet is used to enlarge the tiny misalignment of shaft coupling and improve the sensitivity of monitoring system. The monitoring system realizes the prejudgment of the fault of the transmission shaft, using program controlling to stop the fan and issue alarm, protecting the transmission shaft and related facilities.