The invention relates to the technical field of the preparation of novel environment-friendly absorbing agents, and in particular relates to a method for preparing vermicompost activated carbon by utilizing vermicompost. The method comprises the following steps of: airing and drying vermicompost; then crashing, grinding and screening; then immersing by a composite activated agent water solution; then filtering; putting a solid obtained through filtering into an activating oven; heating, preserving the temperature and activating, and then taking out; then immersing by diluted hydrochloric acid; then filtering; washing a filtered cake in an ultrasonic reactor, and then rinsing by deionized water to be neutral; and then drying, crashing and screening, thereby obtaining the vermicompost activated carbon. The vermicompost activated carbon prepared by the method provided by the invention has high absorption capability, has high particle intensity, has a good effect for removing pollutants, is a favorable absorbing agent and a favorable deordorant, and has favorable absorption effect for waste water, heavy metal and foul gases. The method for preparing vermicompost activated carbon by utilizing vermicompost provided by the invention has dual beneficial effects of environment friendliness and economy.