The invention relates to the technical field of mine high strength circular chain heat treatment, in particular to a new mine high strength circular chain monocyclic tempering method. In the prior art, tempering after monocyclic quenching is mostly self-tempering by controlling monocyclic quenching cooling time, and the method is highly related to the experience of an operator, and not easy to becontrolled; in foreign countries, a resistance heating method is also used for carrying out the monocyclic tempering and has non-ideal effect. The invention adopts a medium frequency induction heating method to cause a sing ring of a chain to obtain difference temperature tempering after the quenching, and leads a certain newly-accessed single ring in the chain, which is treated with the tempering and waits for the quenching, to be placed into a solenoid-typed medium frequency inductor; difference temperature tempering is obtained by the induction heating method, the performance of the singlering after the difference temperature tempering is kept to be consistent to that of other chain rings treated with heat treatment in the chain, to which the single ring belongs, and the chain rings adjacent to the single ring is not softened, thus improving the quality and the work reliability of the chain.