The invention relates to a protection device and in particular to a multifunctional power system protection device comprising a multifunctional moving wheel mechanism, a protective casing mechanism, an anti-collision dust-cleaning seat mechanism, a cable peeling mechanism, and a cable cutting mechanism. The device can switch between a flat ground driving mode and a rough road driving mode, can bechanged in height, can dissipate heat, can prevent the system from being polluted by dust, can clean the dust of a filter screen, can avoids colliding, can be easily disassembled, and can peel a cable, can cut the cable, and can protect a cutting blade. The multifunctional moving wheel mechanism is located below the protective casing mechanism, and is welded to the protective casing mechanism. Theanti-collision dust-cleaning seat mechanism is welded to both sides of the protective casing mechanism. The cable peeling mechanism is welded to the protective casing mechanism. The cable cutting mechanism is welded to the protective casing mechanism.