A system for energy recycling using mechanical vapor recompression in a combined chemical process, such as a process comprising the production of ethylene oxide as an intermediate product and the production of the final product ethylene glycol, characterized in that the system comprises: a heat exchange reactor for generating an intermediate material by means of an exothermic reaction and discharging the generated intermediate material, and heat-exchanging heat generated in the exothermic reaction with water supplied from outside so as to generate water vapor; an absorption tank for receiving the intermediate material, and mixing the intermediate material with water, so as to generate an intermediate material aqueous solution; a stripper for receiving the intermediate material aqueous solution, and separating the intermediate material into an intermediate material gas and an intermediate material aqueous solution; an endothermic reactor for receiving the intermediate material water-rich aqueous solution, and reacting the intermediate material with water, so as to produce a final product aqueous solution; an evaporation concentrator for receiving the final product aqueous solution, and heat-exchanging heat of the water vapor from the heat exchange reactor with the final product aqueous solution so as to generate steam; a dehydrating distillation tower for receiving, dehydrating, and purifying the final product aqueous solution discharged from the evaporation concentrator; and a mechanical vapor recompressor for compressing the steam from the evaporation concentrator, and providing the compressed steam as a source of heat or a source of steam supply wherein the mechanical vapor recompressor is in fluid communication with the endothermic reactor, such that the endothermic reactor receives heat from the steam discharged from the mechanical vapor recompressor. a heat exchange reactor for generating an intermediate material by means of an exothermic reaction and discharging the generated intermediate material, and heat-exchanging heat generated in the exothermic reaction with water supplied from outside so as to generate water vapor; an absorption tank for receiving the intermediate material, and mixing the intermediate material with water, so as to generate an intermediate material aqueous solution; a stripper for receiving the intermediate material aqueous solution, and separating the intermediate material into an intermediate material gas and an intermediate material aqueous solution; an endothermic reactor for receiving the intermediate material water-rich aqueous solution, and reacting the intermediate material with water, so as to produce a final product aqueous solution; an evaporation concentrator for receiving the final product aqueous solution, and heat-exchanging heat of the water vapor from the heat exchange reactor with the final product aqueous solution so as to generate steam; a dehydrating distillation tower for receiving, dehydrating, and purifying the final product aqueous solution discharged from the evaporation concentrator; and a mechanical vapor recompressor for compressing the steam from the evaporation concentrator, and providing the compressed steam as a source of heat or a source of steam supply wherein the mechanical vapor recompressor is in fluid communication with the endothermic reactor, such that the endothermic reactor receives heat from the steam discharged from the mechanical vapor recompressor.