The invention relates to a power-load information collecting system for a plant. When products of the plant are on line or equipment is additionally arranged, a power distribution system needs to be re-configured, and electric parameters of all power distribution lines are measured. Each power distribution line is provided with an electric quantity monitoring instrument, and electric quantity datacollected by all the electric quantity monitoring instruments are transmitted to a centralized controller to be processed through power linecommunication. The centralized controller is connected intothe internet through a network interface module, so management staff can use a computer and hand-hold mobile equipment to access a management system of a remote computer.