The invention discloses an automotive power compensation clutch and a clutch method. The power compensation clutch is formed by combining a magnetic powder clutch and a dry clutch. A magnetic powder chain is formed by magnetic powder under excitation current, the principle of transmitting torque by cutting the magnetic powder chain is combined with the working principle of the dry clutch, and therefore double clutches of a traditional automotive wet type friction plate structure are replaced. Torque transmission of the magnetic powder clutch is completed through the effect of shearing the magnetic powder chain under the electromagnetic effect, and therefore power compensation is achieved. The working principle of the dry clutch is used for switching the working state and the non-working state of the clutch. Linear growth and linear reduction of magnetizing current of a magnetic powder sub-clutch are used for completing torque transmission of the magnetic powder clutch and the switching process of the working state of the dry clutch. Compared with traditional wet and dry double clutches, the automotive powder compensation clutch is high in responding speed, free of impacts, noise and pollution, longer in sliding and friction resisting time and capable of achieving controlling more easily.