The invention relates to a horizontal methanol combustion device. The horizontal methanol combustion device comprises a body, a combustion disc and a heating gun. The combustion disc is arranged at the rear end of the body. An air inlet is arranged between the body and the combustion disc. The body comprises a heat supply port, a gasification cavity and a liquid spraying pipe. The heat supply port is formed in the front end of the gasification cavity. The liquid spraying pipe is arranged in the gasification cavity and connected with a fuel tank through a fuel pipe. The combustion disc is further provided with a preheating opening corresponding to the gasification cavity, and the heating gun is matched with the preheating opening. The horizontal methanol combustion device has the beneficial effects that by means of the design of the methanol combustion device, methanol can be sufficiently combusted, enough methanol can be combusted in the unit time according to needs, and the stable energy supply source is provided. The device is easy to use, convenient to operate and low in manufacturing cost. In addition, according to the using situation of actual production, the horizontal combustion device is designed, and a good using effect can also be achieved when the combustion device is put down to be used.