The utility model relates to a novel air motor, which comprises a casing (1), and a stator (2) and a rotor (3) which are arranged in the casing (1). An air chamber (6) between the stator (2) and the casing (1) is communicated with an air outlet channel (5); a plurality of air holes (7) are formed on the part where the air chamber (6) contacts with the stator (2); an air inlet channel (4) arranged on the casing (1) is communicated with the cavity of the stator (2); and the novel air motor is characterized in that a gap (8) is left between the stator (2) arranged between the stator (2) and the casing (1), and the stator (2) is arranged between an air chamber (6) and the air outlet channel (5); a sealing ring (9) is clamped at the part where the stator (2) contacts with the casing (1); and the outer diameters at two end parts of the stator (2) tightly contact with the inner diameter of the matched part of the casing (1). The novel air motor has the advantages of skillful structure, reasonable design, low noise during operation, and high efficiency.