The invention discloses a radio frequency link switching device for an IOT (interoperability test) and an IOT method. The radio frequency link switching device comprises one or more tested equipment ports and a plurality of base station ports, wherein the base station ports are respectively connected with the equipment ports through coaxial switches and attenuators; the attenuators comprise one or more adjustable attenuators. The IOT method comprises the following steps: switching off each coaxial switch; connecting tested equipment with the equipment ports, and connecting a plurality of base stations to the base station interfaces respectively; ensuring link connection between the base stations to be tested and the tested equipment; adjusting the adjustable attenuators connected between the base stations to be tested and the tested equipment, and simulating signal intensity changes between the base stations to be tested and the tested equipment, wherein the tested equipment is switched over among the base stations to be tested, and the IOT is finished. The radio frequency link switching device and the IOT method are higher in test accuracy and test efficiency, simple to realize, convenient to operate and low in cost. Through the adoption of the radio frequency link switching device and the IOT method, a test instrument can be necessarily protected from damage caused by overheated radio frequency power, DC instantaneous discharge and electrostatic discharge (ESD).