The invention provides an optical signal monitoring method for an optical module and the optical module. The method comprises an MCU receives optical signal monitor information sent by a first receiving end and a second receiving end respectively, wherein the optical signal monitor information is obtained when the first receiving end and the second receiving end carry out monitoring on the received optical signals according to indication of a first monitor trigger signal; and the MCU carries out calculation processing on the optical signal monitor information reported by the receiving end corresponding to the monitoring indication according to the first monitor trigger signal and the monitoring indication to obtain a monitoring value. The method controls monitoring of a plurality of optical signals through a path of Trigger signal, thereby preventing monitoring conflict due to use of a plurality of Trigger signals, and ensuring monitoring information accuracy of the optical signals.