The invention relates to a tunnel type blue light sterilization device which relates to the technical field of blue light sterilization. The tunnel type blue light sterilization device is characterized by comprising a blue light tunnel, a conveyor belt I and a conveyor belt II; the conveyor belt I is located directly above the conveyor belt II, and the length of the conveyor belt II is larger thanthe length of the conveyor belt I, the lower belt face of the conveyor belt I corresponds to the upper belt surface of the conveyor belt II, and an adjusting and positioning device for adjusting thedistance between the lower belt surface of the conveyor belt I and the upper belt surface of the conveyor belt II is arranged between the conveyor belt I and the conveyor belt II. The belt surfaces ofthe conveyor belt I and the conveyor belt II are transparent, and the belt surfaces of the conveyor belt I and the conveyor belt II are concave arc surfaces. The blue light tunnel corresponds to thelower belt surface wrapping the conveyor belt I and the upper belt surface wrapping the conveyor belt II, and the axis of the blue light tunnel is correspondingly located at the center position of theconveyor belt I and the conveyor belt II. According to the tunnel type blue light sterilization device, the problem that a traditional blue light sterilization device cannot irradiate the whole surfaces of fruits and vegetables to be treated is effectively solved.