The invention discloses an on-line multidimensional gas chromatographic analysis device universal for low carbon catalytic conversion reaction. According to the on-line multidimensional gas chromatographic analysis device, a high-temperature gas sampling valve, two ten-way valves and a six-way valve are combined used for realizing automatic real-time sampling of high temperature gases in three channels in reaction processes; autoinjection of a flame ionization detector channel is realized via switching the six-way valve; and sample injection and blowback of two thermal conductivity detector channels are realized via the two ten-way valves; and separation of permanent gases, saturated hydrocarbons, olefins and aromatic hydrocarbons is realized via chromatographic column combination with different characteristics, the three dependent separating channels and switching chromatographic columns. The on-line multidimensional gas chromatographic analysis device is capable of realizing on-line continuous analysis, automatic sampling, autoinjection, sample blowback, switching of chromatographic columns, and the like; is capable of realizing on-line analysis of various high-temperature reaction products and produced gases in low carbon catalytic conversion reaction processes at the same time; and is an universal on-line analysis device used for low carbon catalytic conversion reaction.