The utility model relates to a crude oil heating furnace, in particular to a device aiming at the comprehensive utilization of the heating of an oil-water well, which is formed by a furnace cylinder body, a thermal insulation wall, a burner, a gas-saving radiator, a sensor, a probe, a main controller, a liquid inlet pipe, a liquid outlet pipe and so on. Fuel gas burns in the burner and produces thermal current with a temperature of 300 DEG C or so, the thermal current produces low-intensity heat energy electromagnetic wave through the gas-saving radiator and directly transfers heat to an object or a liquid which needs to be heated, and the temperature is quickly increased, thereby ensuring that the outlet temperature is controlled to be an about 30 DEG C difference with the ambient temperature, so that the heat transfer rate of the object or the liquid which needs to heated in the furnace cylinder body is fully utilized, and having the heat efficiency high up to more than 95 percent.