The invention relates to a temperature-controlled heat-conducting oil down drying machine, wherein the interlayer of a barrel body of the down drying machine is filled with heat-conducting oil; a plurality of temperature sensors are distributed in the heat-conducting oil uniformly; a plurality of groups of electric heating tubes are arranged in the interlayer of the barrel body uniformly; sieve plates are arranged on the end covers of the left end and the right end of the barrel body respectively; air tanks are arranged outside the sieve plates; an air flue is connected between the left air tank and the right air tank; an air inlet and a suction opening are connected in the middle of the air flue through a four-way reversing valve; the air inlet is sequentially connected with an air preheater and a fan cover; a radiator connected with the inner cavity of the barrel body is arranged outside the air preheater; air is heated through external heat source; the suction opening is sequentially connected with a dehumidifying draft fan and a driving motor I of the dehumidifying draft fan; a humidity sensor is arranged at the suction opening; and the motor I, the humidity sensor, the electric heating tubes and the temperature sensors are respectively connected with a programmable logic controller (PLC).