The invention discloses heat source equipment for soil purification through thermal desorption. The heat source equipment comprises a columnar heating furnace shell with a vertical gesture; an inner cavity of the heating furnace shell is a columnar combustion cavity; a heat conducting oil heat exchange pipe is spirally coiled on the inner wall of the combustion cavity; the spiral upper end of theheat conducting oil heat exchange pipe communicates with an oil inlet pipe, and the spiral lower end of the heat conducting oil heat exchange pipe communicates with an oil outlet pipe; and as a centrifugal flaming gyro is located in a continuous rotating state under a recoil effect of flaming, flame sprayed from tail end nozzles of all elbow pipes can periodically and continuously sweep the spiral-coiled heat conducting oil heat exchange pipe by a whole lap to realize the overall heating uniformity of the heat conducting oil heat exchange pipe.