The invention discloses a fire extinguisher comprising a tank body; the left end of the inner cavity of the tank body is filled with a nanometer dry chemical fire extinguishing agent, and the right end of the inner cavity of the tank body is filled with a hot aerosol fire extinguishing agent; the lower end of the right side of the outer surface of the tank body is fixedly connected with a supporting seat; the middle end of the bottom of the inner cavity of the supporting seat is fixedly connected with a storage battery; a smoke sensor is embedded in the middle end of the right side of the outer surface of the supporting seat; the middle end of the top of the supporting seat is fixedly connected with an electric telescopic rod; the top end of the electric telescopic rod is fixedly connected with a connecting rod; the middle end of the left side of the outer surface of the tank body is fixedly connected with an oxygen tank; and the middle end of the top of the oxygen tank is movably connected with an oxygen pipe. The smoke sensor is embedded in the middle end of the right side of the outer surface of the supporting seat, and the problem of inconvenience brought for people during fire extinguishing because all the existing fire extinguishers are manually-started/stopped fire extinguishers is solved through the effects of the electric telescopic rod, the connecting rod and a movable handle.