The invention discloses a dynamic gradient pH three-stage countercurrent extraction process for tobacco waste raw materials of reconstituted tobacco. In the process of extracting the tobacco waste raw materials by a three-stage countercurrent extraction process in the prior art, acid liquor and alkali liquor with certain concentration and flow rate are uniformly pumped into an extraction system to realize dynamic gradient change of a pH value of an extraction and mixing system at each stage in the three-stage countercurrent extraction process. The process provided by the invention can obviously increase extraction efficiency of aromatic components in the tobacco waste raw materials, greatly improve sensory quality of a finished product of reconstituted tobacco, and also better regulate balance of chemical components in the reconstituted tobacco. In addition, a method of the invention has advantages of low cost, remarkable effect and relatively good application prospect.