The invention discloses a multifunctional C4F7N/CO2 mixed gas distribution system. A C4F7N heat exchanger is used for heating and vaporizing C4F7N input through a C4F7N input port; a CO2 heat exchanger is used for heating and vaporizing CO2 input through a CO2 input port; a C4F7N/CO2 mixing pipe structure is used for mixing the heated C4F7N and the heated CO2, and a C4F7N/CO2 mixed gas output pipeis used for outputting the mixed C4F7N/CO2 gas; the C4F7N/CO2 mixing pipe structure comprises a C4F7N/CO2 dynamic gas distribution pipe structure and a C4F7N/CO2 pressure distribution mixing pipe structure; the C4F7N/CO2 pressure distribution mixing pipe structure comprises pressure distribution mixing tanks, and the pressure distribution mixing tanks are used for mixing the CO2 and the C4F7N after constant pressure treatment and arranged parallelly. The invention further discloses a multifunctional C4F7N/CO2 mixed gas distribution method. The multifunctional C4F7N/CO2 mixed gas distributionsystem and method have the advantages that the gas distribution speed is high, and the gas distribution precision is high.