The invention relates to a friction energy accumulation clutch at an idle speed. A bearing is arranged on a crank shaft, a flywheel is provided with a plurality of rotating magnets, a short shaft is matched with the bearing, and a driven shaft is provided with a convex groove which is matched with a concave groove on a driven plate capable of sliding along the convex groove in a transverse direction; the driven plate is provided with spoke ribs, a lead wire is winded around the spoke ribs in a transverse direction, led out through a lead slot on a slippage rod, and connected with a wiring terminal, a friction lining is fixed on the ring surface of the driven plate, a pressure plate is fixedly connected with a sliding sleeve and provided with a plurality of slippage rods which are matched with a plurality of slippage holes on a clutch cover, and a spring is fixed between the pressure plate and the clutch cover by a spring plunger. The clutch can easily realize energy transformation and has low cost, thereby being capable of effectively recycling large percentage of energy consumption of vehicles running at idle speed, improving the fuel utilization ratio of an entire car and reducing the environment pollution of the car.