The invention discloses a novel convenient and practical arc and harmonic elimination and overvoltage protection three-purpose device, and belongs to the field of arc elimination and overvoltage protection. The novel convenient and practical arc and harmonic elimination and overvoltage protection three-purpose device comprises high-voltage current-limiting fuses, a zinc oxide nonlinear resistor, an overvoltage protection controller, a harmonic oscillation capacitor, a harmonic oscillation resistor, a harmonic elimination controller, a voltage transformer, a microcomputer, an arc elimination controller and a linear arc elimination resistor. The high-voltage current-limiting fuses, the zinc oxide nonlinear resistor, the overvoltage protection controller, the harmonic oscillation capacitor, the harmonic oscillation resistor, the harmonic elimination controller, the voltage transformer, the microcomputer, the arc elimination controller and the linear arc elimination resistor are arranged in the novel convenient and practical arc and harmonic elimination and overvoltage protection three-purpose device. The novel convenient and practical arc and harmonic elimination and overvoltage protection three-purpose device is novel in design and convenient to use. The novel convenient and practical arc and harmonic elimination and overvoltage protection three-purpose device is provided with an arc and harmonic elimination system and an overvoltage protection system, so that the arc elimination and overvoltage protection requirements are met.