The invention relates to a novel process for recovering metallic rhenium from copper smelting waste acid. The novel process comprises the following steps: through pretreatment, centrifugal extraction, centrifugal washing, centrifugal reverse extraction, concentration, freezing crystallization and recrystallization, so that valuable metallic rhenium in the copper smelting waste acid is recovered, and a high purity ammonium rhenate product is obtained; and meanwhile, the on-line and automatic PLC control is realized in the overall technological process design. With the adoption of the novel process for recovering metallic rhenium from the copper smelting waste acid provided by the technical scheme of the invention, the following benefits are achieved: 1, the technological process is short, the operation is simple and convenient; 2, the equipment floor area is small, the investment cost is low, and the cost can be controlled at RMB1450 Yuan / kg of ammonium rhenate; 3, the degree of automation is high, and the on-line monitoring and controlling are realized; 4, compared with the conventional box-type extraction process, the novel process has the advantages as follows: the extraction efficiency is high, the organic phase retention volume is small, the extraction balance in all time periods is achieved, the real-time start / stop is realized, the treatment capacity is high, the emulsification is eliminated, the on-line cleaning is realized, the recovery rate of valuable metallic rhenium is high, and the separation effect of valuable metallic rhenium from metallic impurities is good; and 5, the sewage quantity is small, the secondary pollution is avoided, and the environmental friendliness is achieved.