The invention relates to the technical field of tail gas recovery treatment, in particular to a polypropylene VOCs treatment environment-friendly recovery system. The system comprises a flash evaporation replacement tail gas recovery system and a feeding hopper activator nitrogen pressure feed system. The flash evaporation replacement tail gas recovery system comprises a bag-type dust remover, a vacuum compressor unit, a water-vapor separation tank, a pre-condenser, a drying tower, a gas tail gas dehydration tower, a gas holder oxygen content analyzer, a gas oxygen content analyzer, a propylene recovery gas holder, a first communicating pipe, a second communicating pipe, a first gas exhaust holder switching valve and a first gas exhaust switching valve. The feeding hopper activator nitrogen pressure feed system comprises nitrogen buffer equipment and a nitrogen buffer tank, the input end of the nitrogen buffer equipment is communicated with the nitrogen tank, the output end of the nitrogen buffer equipment is communicated with the nitrogen buffer tank, and the output end of the nitrogen buffer tank is communicated with the nitrogen pipe network so that propylene can be recycled, the enterprise cost is reduced, the enterprise economic efficiency is improved, VOCs are prevented from being discharged, and the environmental protection property is improved.