The invention provides a power load control system and a method. The system comprises a master station, a front-end processor and object communication managers. The master station is used for detecting actions of a control switch, organizing an original control message according to switch archives and attaching the original control message into a Modbus TCP (transmission control protocol) message, communication parameters of the corresponding communication manager are attached to a message header, and an assembled message is transmitted to the front-end processor; the front end processor is used for determining the object communication manager according to the communication parameters in the message header of the message transmitted from the master station, and transmitting the message to the corresponding object communication manager after the message header is removed; and the corresponding object communication manager acquires the original control message from the message transmitted from the front-end processor, analyzes the original control message, determines a control mode, a load control mechanism to be controlled and a control type, and realizes corresponding control operation according to determined information. By the aid of the power load control system and the method, staffs only need to operate corresponding control switches on the master station to control load control mechanisms, namely, the load control mechanisms are remotely controlled.