The invention discloses a simulation terminal testing method based on a third-party platform. A diagram model provided by a gis is led into the third-party platform through a simulation terminal by arranging a channel master station and simulating the environment of an access terminal to be used for simulating a circuit diagram of the channel master station, and topology conditions of a line and the remote measurement amount and the switching states of a switch are observed through the circuit diagram. By means of the simulation terminal testing method, the diagram model provided by the gis can be led into the third-party platform by arranging the channel master station to be used for simulating the circuit diagram of the channel master station, the topology conditions of the line and the remote measurement amount and the switching states of the switch can be visually observed, the time for testing joint debugging between a distribution network master station system and the terminals on site is effectively shortened, and the on-site station-connection progress is quickened.