The invention discloses an air conditioner and a rotary compressor thereof, wherein the rotary compressor comprises a motor and a pump body; a crankshaft is positioned in a rotor of the motor and is fixedly connected with the rotor; an oil passage is formed in the crankshaft; the oil inlet of the oil passage is positioned at the upper end of the crankshaft and the oil outlet is positioned below the oil inlet; the rotary compressor further comprises a gear pump, a top base and a partition; the gear pump is arranged on the upper side of the motor and is provided with an inner rotor and an outer rotor; the inner rotor is fixedly connected with the upper end of the crankshaft; the outer rotor is arranged on the outer side of the inner rotor in a sleeving manner; an oil drainage cavity of the gear pump is communicated with the oil inlet of the oil passage; the top base is arranged on the upper side of the motor; an accommodating tank is formed in the lower end of the top base and the gear pump is positioned in the accommodating tank; an oil inlet is formed in the upper end of the top base; the oil inlet of the top base is communicated with an oil suction cavity of the gear pump; the partition is fixedly connected with the lower end of the top base; the partition blocks the opening of the accommodating tank; the crankshaft is fixedly connected with the inner rotor by penetrating through the partition. The rotary compressor can effectively solve the problem that the oil return amount of a conventional rotary compressor is small.