The invention discloses a process capability evaluation method based on whole leaf threshing and redrying production, which comprises the following steps: firstly, determining a core production process, a process and a CTQ project of the whole leaf threshing and redrying production, and determining the weight of each project in an evaluation model by adopting a Delphi method; Secondly, according to the evaluation project, determining collection period, grade or module information, and collecting each CTQ data and each grade or module yield data; performing Calculating to obtain the qualification rate of each CTQ project; According to the CTQ project and the weight,the Process weight, the weight of the core production process,and the yield weight of each grade or module, utilizing a formulato calculate and obtain the process qualification rate, the core production process qualification rate, the standard qualification rate data and the overall qualification rate of the product, so thatthe process capability level of a redrying enterprise for producing a certain grade (module) or all grades (modules) is judged, and a basis is provided for quality analysis and improvement of the redrying production process.