The utility model relates to a power network system based on full-load switch networking. The power network system comprises an incoming line, an intelligent terminal unit, a load, a tie line and a main line. Wherein the incoming line and the load are electrically connected with the main lines respectively, the tie line is connected with two different main lines, the tie line and the main lines are provided with intelligent terminal units, the incoming line is connected with an external power supply, and the adjacent intelligent terminals are connected with each other; according to the utilitymodel, two adjacent intelligent terminal units are communicated with each other; a protection substation of the system is canceled, risks possibly caused by substation breakdown are solved, logic judgment only knows the state between the protection substation and an adjacent switch, the method is simple and reliable, meanwhile, two adjacent intelligent terminal units communicate nearby, rapid fault positioning and removing can be achieved, and line impact is small.