Thermo-reversible elastomers (TRE) can be repeatedly processed and reused, and thus can reduce the dependence of the petroleum for synthetic rubber and can reduce solid waste for environmental protection and resource saving. The preparation of TRE are generally carried out in solution, which require solvent and long reaction time. These disadvantages limit the large scale preparation of TRE. In this study, we used epoxidized natural rubber (ENR) as the matrix and designed a new method to prepare TRE with good thermo-reversibilityby catalyzed ring-opening (RO) of ENR followed by Diels-Alder (DA) reaction through one-step melt blending for the first time toward rubber recycling. Furfurylamine (FA) was first grafted onto ENR by RO reaction under the presence of catalyzer, and then bismaleimide (BMI) was added to crosslink with FA grafted ENR via DA reaction, which can be easily realized during melt blending. TRE with comparable crosslink density to traditional crosslinked rubber was achieved by optimizing the ratio of FA and BMI. This method was carried out in Haake rheomixer at short reaction time, and it requires no solvent and does not produce stimulating smell. This new technique is promising in industry for rubber recycling and large-scale preparation of TRE.