The invention provides a liquid fuel gasifier which is composed of a gasifying device, a burning device, a sound reducing device, a fire ring, a valve body assembly and a fixed frame. The gasifying device is placed above the burning device and is arranged in the sound reducing device. The burning device is partially or completely arranged in the sound reducing device. The gasifying device is composed of a gasifying pipe, a heat insulation pipe and a gas resistor. The gasifier is structurally characterized in that the gasifying pipe is arranged in the heat insulation pipe, the gas resistor is inserted in the gasifying pipe, the gasifying pipe and the gas resistor are combined and inserted to form a combination piece which is wound to form a spiral spring column body or a conical body, the gasifying pipe is a metal hollow pipe or a non-metal high temperature resistant hollow pipe, the heat insulation pipe is a metal hollow pipe, the length of the gas resistor and the heat insulation pipe is shorter than that of the gasifying pipe, the sound reduction device is of an annular columnar structure or a conical structure, and the sound reduction device is placed in the fire ring and surrounds the gasifying device and the burning device. The liquid fuel gasifier resolves the problem that the liquid fuel is completely gasified, enables burning to be complete, is low in energy consumption, saves energy by over 60% with flame temperature higher than 1200 DEG C, does not require a fan, is complete, convenient, electricity-saving, strong in fire and high in heating speed, simultaneously effectively controls gasifying temperature, resolves the problem of carbon accumulation and changes popularization of the liquid fuel especially alcohol group liquid fuel from ideal to reality.