The embodiment of the invention provides a method and device for processing logs in a cloud computing system. The method comprises the steps of obtaining current traffic rate information of logs generated by Apps deployed in the cloud computing system; judging whether current log traffic rates of the Apps (Applications) are greater than or equal to a traffic rate threshold or not according to the traffic rate information and the preset traffic rate threshold; and when the log traffic rates are greater than or equal to the traffic rate threshold, sending the obtained logs of the Apps to a log collection server in the cloud computing system according to the traffic rate threshold and caching temporarily unsent logs in a cache device. According to the embodiment of the invention, through arrangement of the traffic rate threshold, even if the log traffic rate of certain App reaches the limit, the logs newly generated by the other Apps can be processed timely, so the log timeliness can be improved.