Power capacitor protection device

The utility model relates to the technical field of capacitors, in particular to a power capacitor protection device which comprises a fixing mechanism, a main body mechanism and a heat dissipation mechanism, the fixing mechanism is fixedly arranged in the main body mechanism, and the heat dissipation mechanism is fixedly arranged at the top of the main body mechanism. The fixing mechanism comprises a soft rubber pad, a supporting plate, a movable column, a movable spring, a protective inner shell, a pull rod, an extension spring, a switch and a side fan, and the soft rubber pad is fixedly arranged on the supporting plate. Before the power capacitor protection device is used, the bottom of the protection shell is aligned with the top of a capacitor, a switch is pulled to stir outwards to enable an extension spring and a pull rod to linearly move outwards, meanwhile, a supporting plate and a soft rubber pad are driven to move outwards, and the supporting plate further compresses a movable column and a movable