The invention relates to a technological process voltage sag tolerance evaluation method considering motor restarting. The method comprises the following steps: S1, collecting equipment of an industrial process of induction motor restarting and acquiring an equipment list; S2, acquiring a PIT list of a single piece of equipment under different voltage sag degrees; S3, with MATLAB/Simulink software, simulating and calculating further changes of a bus voltage due to induction motor restarting after sag with a given amplitude on the equipment; S4, according to an obtained final voltage sag amplitude, acquiring an actual PIT under the amplitude by using the PIT list and filling in the equipment list; S5, according to the determined PIT values of all equipment, determining priority levels of equipment; and S6, repeating steps from S3 to S5 and completing evaluation of voltage sag amplitudes under all working conditions to obtain final tolerance evaluation data. According to the invention, the endurance capability of the production process to the voltage sag can be evaluated and a key device, equipment or an equipment group influencing the sag endurance capability of the production process can be found.