The invention relates to a single-phase bipolar air insulated switchgear which comprises an air chamber, a cable chamber, an instrument chamber and a breaker. The air chamber is fixed at the top of the cable chamber, the instrument chamber is fixed at the right side of the cable chamber, an inner cavity of a box body of the air chamber is divided by clapboards into a bus chamber, a breaker chamber and an auxiliary air chamber which are relatively sealed, the breaker is arranged in the breaker chamber and fixedly connected with the inner wall of the box body, the bus chamber is internally provided with a first bus connector, a rotating shaft, a first level bus, a second level bus, a first connecting block, a second connecting block, an insulated pull rod, a third static contact, a fourth contact and a movable knife head which is connected with the rotating shaft by the insulated pull rod, and the bus chamber and the breaker chamber are respectively and internally provided with air insulated media. The invention has greatly improved insulation performance, reduced electric gap and greatly reduced whole cabinet size, thereby reducing floor area and fully utilizing soil resources.