Idling start-stop system used for automatic transmission

The invention relates to the field of automobile production, and provides an idling start-stop system used for an automatic transmission. The system comprises an input shaft, a one-way clutch, a friction clutch and an oil pump, wherein the input shaft is used for introducing torque; the one-way clutch comprises an outer seat ring and an inner seat ring fixed to the input shaft; the friction clutch comprises a pressing plate and a flywheel, the pressing plate and the flywheel are coaxial with the outer seat ring, and the pressing plate is separated from /locked to the flywheel under the action force of the outer seat ring; the oil pump supplies oil to a clutch oil cylinder of the automatic transmission under the drive of the flywheel. The oil pump of the system does not participate in work when an automobile normally runs at high speed, and accordingly energy waste is reduced. In the temporary parking process of the automobile, the flywheel drives the oil pump to supply oil to the clutch oil cylinder of the automatic transmission, so that the automatic transmission is in a ready-to-start state when the automobile needs to start again. After the oil pump of the system is started, pressure is set up and starting is achieved without the need of the oil filling process of the clutch oil cylinder, and the starting process is accelerated. Besides, the system is simple in structure and low in production cost. In addition, due to the fact that oil supply pressure of the oil pump is low, complex sealing measures are not required.