The invention discloses a multifunctional blow lamp and an application method. The multifunctional blow lamp is characterized in that a fuel storage tank and a flame tool are located on the two sides of an air supply device, and the fuel storage tank, the flame tool and the air supply device are fixed to a supporting keel and connected through an air supply pipeline; a flame gun assembly of the flame tool is installed at the upper end of a lifting assembly, a horizontal rotating assembly is indirectly connected with flame guns through lifting, a horizontal linear movement assembly is indirectly connected with the flame guns, the flame guns ascend and descend through the lifting assembly, and the flame guns reversely move on an operation table panel; a liquid fuel injection port and a fuel gas inlet pipe are arranged at an upper cone of the fuel storage tank, a gas head is arranged in a lower cone, and an emptying valve is arranged outside the lower cone; and according to a circuit, a series circuit composed of an air pump motor switch, a motor and a speed adjustor is connected with a series circuit composed of a heat source box resistor switch, a heat source box resistor and a thermosistor in parallel and then connected with a shutdown switch in series to be connected to a main power source. When fuel needs to be added, an overturning plate is pulled, and power supply is turned off. The multifunctional blow lamp and the application method are used for experiment teaching, machining and repairing industries, the experiment operation efficiency is improved, personal safety is guaranteed, and the fire risk is reduced.