Abstract: An indoor power line transmission control system, includes: a transforming dimming controller (1), which is used to load, onto an electrical signal, a received dimming signal sent by a mobile terminal or input by a user in a touch-control manner, and send the electrical signal loaded with the dimming signal to a dimming driver (2); and the dimming driver, which is electrically connected with the transforming dimming controller and a dimming luminaire (3), and used to read the electrical signal loaded with the dimming signal, and adjust a gray scale of the dimming luminaire according to the read electrical signal. By replacing a normal switch with the transforming dimming controller and by using the dimming driver and transmitting the dimming signal to the dimming luminaire by means of a power line, flexibility of having no wiring, simple extension and smart dimming are realized and energy can be saved.