The utility model discloses an unconventional fracturing flowback fluid reinjection treatment system comprising a gel breaking coagulation reaction tank connected with a sewage inlet and a fine filtration tower connected with a sewage outlet, wherein a disc filter press and a pH value adjusting tank are sequentially connected between the gel breaking coagulation reaction tank and the fine filtration tower through a pipeline; a power-enhanced agitator is arranged inside the gel breaking coagulation reaction tank; a Fe/C micro-electrolysis reaction tank is also connected in parallel between the gel breaking coagulation reaction tank and the disc filter press; the Fe/C micro-electrolysis reaction tank is also connected with an air compressed aerator. The unconventional fracturing flowback fluid reinjection treatment system has the following advantages: 1, the unconventional fracturing flowback fluid is subjected to efficient gel breaking and coagulation treatment; 2, the traditional treatment method is replaced, and the oil, organic matters, suspended matters and color scales in sewage are well removed; 3, the unconventional fracturing flowback fluid reinjection treatment system is simple in process, reliable in performance and convenient to operate and maintain; 4, the quality standard of reinjection water can be completely met, the oil content in the sewage is lower than 30mg/L, the suspended matter content in the sewage is lower than 10mg/L, and the pH value of the sewage ranges from 6 to 9.