The invention discloses a device and method for recovery of olefin monomers in tail gas from polypropylene production. The device comprises an olefin monomer recovery tower and a hydrophobic aggregation packing assembly; the olefin monomer recovery tower is provided with an exhaust inlet, an exhaust outlet and an olefin monomer outlet; the exhaust outlet is higher than the exhaust inlet; the exhaust inlet is higher than the olefin monomer outlet; the hydrophobic aggregation packing assembly is arranged in the inner cavity of the olefin monomer recovery tower, between the exhaust inlet and exhaust outlet, and near the exhaust outlet. Through arrangement of the hydrophobic aggregation packing assembly in a traditional olefin monomer recovery device, the recovery device of the invention increases the coalescence opportunity of tiny propylene droplets, reduces the opportunity of entraining propylene droplets by ethylene, increases the opportunity of ethylene dissolving in propylene, improves the efficiency of ethylene absorption by propylene in recovery device, not only reduces the treatment cost and energy consumption, but also simplifies the process, and is easy for scale application.