The present invention provides a biomass power plant resource comprehensive utilization system, which comprises: a biomass incineration power generation device, wherein the biomass incineration powergeneration device is used for incinerating biomass garbage to generate electricity, and comprises an incinerator, and the incinerator incinerates the biomass garbage to generate slag; and an active carbon preparation device connected to the biomass incineration power generation device, wherein the active carbon preparation device comprises an activation furnace, and the activation furnace activates at least one part of the slag so as to prepare active carbon. According to the biomass power plant resource comprehensive utilization system of the present invention, biomass incineration power generation and active carbon preparation are combined, and the ash residue generated by the biomass incineration power generation is used in the preparation of active carbon, such that the environmental pollution caused by the ash residue can be avoided, the resource utilization rate is improved, the problem that the ash residue landfill requires the land resource is solved, the infrastructure sharingof biomass incineration power generation and active carbon preparation can be achieved, the land occupation is saved, the investment is saved, and the production cost is reduced.