The utility model discloses a chain saw magnetor which comprises a rotor assembly and a stator assembly, wherein the stator assembly is arranged at the periphery of the rotor assembly; the rotor assembly comprises a rotor, a magnetic pole iron core and magnetic steel, and the magnetic pole iron core and the magnetic steel are fixed on the rotor; the stator assembly comprises a stator, a high-pressure cap, a high-voltage wire and a spark plug cap, wherein the spark plug cap is fixedly connected with the stator through the high-voltage wire, and the high-pressure cap is sleeved on the high-voltage wire; the rotor assembly is arranged on an engine crank through a center tapered hole and rotates together with the engine crank, and the stator is fixed on an engine box body; and the stator iron core and the rotor external element keep a gap of 0.3-0.5mm. The chain saw magnetor is convenient for installation and maintenance, ensures the property requirement on the engine, and lightens the weight.