The invention relates to a combined type industrial dust explosion simulation demonstration system which comprises a dust explosion reaction observation pipeline, a variable frequency axial flow fan arranged at one end of the dust explosion reaction observation pipeline, a dust collector arranged at the other end of the dust explosion reaction observation pipeline and communicated with the dust explosion reaction observation pipeline, a dust conveying unit located between the variable frequency axial flow fan and the dust collector and communicated with the dust explosion reaction observation pipeline, an ignition detection control unit arranged on the dust explosion reaction observation pipeline, a dust collection box arranged at the bottom of the dust collector, a purified air pipeline communicated with the top of the dust collector, as well as a tail gas purifier and an electronic controller that are communicated with the purified air pipeline. Compared with the prior art, the system disclosed by the invention is maintained easily, is suitable for various conditions, has the characteristics of being carried conveniently, being simple in operation, good in an explosion display effect and high in cost performance and the like, and can be used for a dust explosion test and a practical training demonstration at any time everywhere.