To provide a heating device of farm soil, using a thermal pipe, which is capable of efficiently performing crop cultivation and rearing by heating the soil of a farm or the like and performing thermal disinfection of the soil together with the solar heat in summer, rich in heat reserving property, having a large heat radiating area, and sufficiently applicable to a hillside farm.

A heating device for increasing the soil temperature of a farm is provided with a thermal pipe buried in the soil and filled with a heat reservoir of iron sand around an electric heater; wherein the diameter of the thermal pipe is in the range of 30-150 mm, and a heating controller of the electric heater is provided to control the heat reservoir temperature of the specific position in the thermal pipe to be within a predetermined temperature range.