The present disclosure provides an access method, an internet of things platform, an application device and a service device. The access method applied to the internet of things platform includes: receiving an operation request message transmitted by an application device for accessing a service device, where the operation request message carries position information of the application device; determining whether the application device is capable of establishing connection with the service device according to the position information of the application device; when determining that the application device is capable of establishing connection with the service device, transmitting an operation response message carrying instruction information to the application device, where the instruction information is used to instruct the application device to access the service device.