The utility model discloses a deodorization device utilizing bio-trickling filtering. The deodorization device is equipped with a box body, wherein a vertical baffle is arranged in the box body and divides the space in the box body into an operation section for normal operation and a maintenance section which is run during maintenance; the bottom of a reactor is an odor inlet channel, and is arranged with a three-way valve used for directing the odor to the operation section or the maintenance section respectively; a horizontal grid plate is arranged above the odor inlet channel; the grid plate is coated with a gauze layer; a bio-deodorization material layer is arranged on the gauze layer of the operation section; an adsorption material layer used for adsorbing the odor is arranged on the gauze layer of the maintenance section; a water pipe for spraying water and a spray header are arranged above the operation section; an operation air outlet and a maintenance air outlet are formed in the top plate of the box body; a spraying water discharge and water return pipe is arranged at the bottom of the box body. The deodorization device is suitable for purification of odor, has a relative strong self-control function, is low in cost, flexible to control, and convenient to maintain, can operate continuously, and has a better deodorization effect.