The utility model provides an integrated biofilter which comprises a housing, wherein a box body, a gas distribution system and a water tank arranged at the inner bottom of the box body, a biofiltration bed arranged at the upper part of the gas distribution system, a sprinkling chamber arranged above the water tank and connected with the water tank through a water pipe, an air inlet formed on the side wall of the box body and an air outlet formed at the top of the box body in the position far away from one end of the air inlet are arranged in the housing. In the utility model, a pretreatment unit which is installed in front of the biofilter is integrated with the biofilter in the same box body, all the components for waste gas treatment are arranged inside the housing, so as to form an integrated filter capable of finishing all waste gas treatment process independently; and a user can place the integrated biofilter in an area to be filtered without mounting additional equipment on the spot and directly use the biofilter to filter, thereby facilitating use and transportation of the biofilter.