A clothing treatment apparatus includes a cabinet which forms a treatment space for accommodating clothing, a duct in which an inside air channel which sucks inside air from the treatment space and guides the inside air to discharge the inside air to the treatment space, and an outside air channel which sucks outside air from an outer space of the cabinet and guides the outside air to discharge the outside air to the treatment space are preset, a fan which moves air in the duct, and (i) an opening and closing module which is operated to change whether or not a through-channel including at least one of an outside air inlet channel between the outer space and the outside air channel and (ii) an exhaust outlet channel between the treatment space and the outer space is blocked.