In an Internet of things (IoT) service routing method, a mapping relationship between a service feature and a network slice is established on an IoT platform, or a routing policy for determining a network slice based on a service feature is established on an IoT platform, so that the IoT platform can select, based on a service feature of a service message sent by an industry application, an appropriate network slice to send a service message to a terminal device, to meet a plurality of network requirements of the industry application.