The invention provides a low-frequency and low-voltage load-reducing control method based on a multi-agent technology, which comprises two processes carried out simultaneously, wherein, in process 1, a local reaction layer triggers a device to act and implement load-shedding control after judging the device meets an action condition according to the measured state quantity information in real time such as local voltage, frequency and the like; and the process 2 comprises the following steps: 1. the local reaction layer uploads the local state quantity information and the actual load-shedding capacity of the device to local coordination layers; 2. the local coordination layers upload a data analysis result to sub-region coordination layers; 3. the sub-region coordination layers calculate local deloading and weighting coefficients for the local coordination layers, and meanwhile upload an information analysis result to a total-network coordination layer; and 4. the total-network coordination layer gathers information uploaded by the sub-region coordination layers, calculates sharply reduced indexes of power-receiving power of a power grid and sub-region deloading and acceleration coefficients for the sub-region coordination layers, sends the indexes and the coefficients to the sub-region coordination layers, and finally sends to the local coordination layers from the sub-region coordination layers.