Epoxidation reaction system and preparation method of epoxypropane

The invention relates to an epoxidation reaction system and a preparation method of epoxypropane. The epoxidation reaction system comprises N + 1 epoxidation reactors and N-1 epoxidation reactor intercoolers, and the N + 1 epoxidation reactors are sequentially connected and receive reaction raw materials or reaction materials from the previous epoxidation reactor so as to generate epoxidation reaction; the N + 1 epoxidation reactors are logic 1 to N + 1 epoxidation reactors respectively, and the logic N + 1 epoxidation reactors are filled with fresh epoxidation catalysts which are not inactivated; the (N-1) epoxidation reactor inter-coolers are the first to (N-1) th epoxidation reactor inter-coolers respectively and are sequentially connected between the logic 1 to N epoxidation reactors so as to carry out heat removal on reaction materials from the logic 1 to (N-1) th epoxidation reactors respectively; wherein N is greater than or equal to 3. According to the epoxidation reaction system, the temperature of t