The utility model relates to an interactive system based on a PLC (Programmable Logic Controller), which comprises a power utilization acquisition platform, a concentrator, an intelligent meter, a router, an interactive terminal, a household intelligent unit and an intelligent management platform, and is characterized in that the power utilization acquisition platform is connected with the concentrator through a 4G network; the concentrator is electrically connected with the intelligent meter; the intelligent meter is electrically connected with the interaction terminal; the intelligent management platform is connected with the router through IOT or NET or 4G, and the router is interconnected with the interaction terminal through WIFI; and the interaction terminal is electrically connectedwith the household intelligent unit. According to the utility model, data acquired by the ammeter can be displayed on the indoor interaction terminal in real time, so that a household user can know the household power consumption condition in time. Value-added service can bring extra income to electric power companies, service application can be applied to scenes which are not particularly urgentand apply for service from power supply companies, and wiring and complaints of 95598 power supply service hotlines are reduced.