The invention discloses a feed device with a quantitative feeding function used in a garbage burning reaction furnace. The feed device comprises a hopper and a valve body arranged under the hopper. A distribution plate is arranged on the material outlet of the hopper, and is rotationally arranged in the valve body through a rotary shaft; one end of the rotary shaft extends out of the valve body to be connected with an output shaft of a motor; the circumference surface of the distribution plate cooperatively works with the material outlet of the hopper, and a plurality of grooves are uniformly formed in the circumference surface; and the grooves are distributed in the circumference direction of the distribution plate. The feed device for a garbage burning reaction furnace has the following advantage that the grooves are formed in the distribution plate, so that when material is fed, active carbon powder and lime powder first fall into the grooves, and then the quantitative active carbon powder and lime powder are thrown into the flue of the garbage burning reaction furnace by rotating the distribution plate to neutralize dioxin and heavy metal so as to ensure that the discharge amount of dioxin and heavy metal in the fume can reach the standard.