The invention discloses a treading type air purifier. The upper half portion of a box body structure is of an air bellow type structure, and the lower half portion of the box body structure is of an air exhaust type structure. The upper plane of the air bellow type structure of the upper half portion is provided with an air bellow upper plate. Two pieces of pressure ceramics are arranged in the middle portion of the air bellow upper plate. A fan-shaped-structure air compression fan is arranged below the air bellow upper plate. An air inlet one-way valve is arranged on the side face of the air compression fan. An air purifying plate is arranged in the air compression fan. The interior of the air purifying plate is composed of a spice block, activated carbon and a filtering net. An air inlet is formed in one side of the air exhaust type structure of the lower half portion, and an air outlet is formed in the other side of the air exhaust type structure of the lower half portion. A power mechanism, a filtering net and a water tank are sequentially arranged in the air exhaust type structure of the lower half portion from the side with the air inlet to the side with the air outlet. Treading type driving is adopted, safety and energy conservation are achieved, the functions of deodorizing, aroma enhancing and moisturizing are achieved, the air quality in a dormitory can be effectively improved, and the body health of students is taken good care of. In addition, the treading type air purifier is simple in structure and cheap in material and has the beneficial effect of being low in cost.