The invention discloses a tubular radiator for a transformer, comprising an upper oil collecting chamber and a lower oil collecting chamber that are parallel to each another and communicated with an oil circuit of the transformer. The upper oil collecting chamber and the lower oil collecting chamber are communicated with a plurality of rows of heat exchange tubes vertical to the oil collecting chambers. The tubular radiator is characterized in that the heat exchange tubes are rolled round or elliptic aluminium or aluminium alloy heat exchange tubes with fins. A stress automatic adjusting device is arranged between the upper oil collecting chamber and the lower oil collecting chamber on both sides of a plurality of rows of the heat exchange tubes. The invention solves the problems of low heat dissipation, easiness to rust and large weight, and has the advantages of high heat dissipation, good corrosion resistance, difficulty to leak and light weight.