The invention discloses a process quality evaluation method based on directional weighted fuzzy Petri network modeling. The method comprises the following steps: according to correlations between production processes and process factors, constructing a process quality chain network hierarchical model which takes process quality as an output process level, takes human, machine, material, method, measurement and ring as a transition output individual level and takes factors influencing the human, machine, material, method, measurement and ring as input factor levels, constructing process quality chain weighted fuzzy Petri network models which are in one-to-one correspondence, defining nine tuples, and performing reasoning rule calculation. By means of the technical scheme, the conduction relation of fluctuation factors among all levels is analyzed, key elements and nodes influencing the process quality are found, the credibility of the whole process quality chain is determined, the dimensionality of an input and output matrix can be effectively reduced, and good universality and fault tolerance are achieved.