The embodiment of the invention provides an Internet of Things cloud platform event recognition method and system. The method comprises the following steps: collecting uplink and/or downlink data packets of an Internet of Things cloud platform port, and identifying the data packets layer by layer to obtain an application layer protocol corresponding to the data packets; if it is judged that the application layer protocol is matched with a target application layer protocol in at least one preset application layer protocol, writing the data packet into a preset class according to a target formatcorresponding to the target application layer protocol, and reading a feature value of the data packet from the preset class; If it is judged that the feature value belongs to a target feature valuedatabase in at least one feature value database, determining that the data packet belongs to a cloud platform event corresponding to the target feature value database. According to the embodiment of the invention, the characteristic value of the data packet of the Internet of Things cloud platform port is extracted, and the cloud platform event is determined according to the characteristic value,so that the Internet of Things cloud platform event can be accurately identified, and a premise guarantee is provided for a subsequent method for solving an Internet of Things safety problem.