The invention discloses an automatic titration method which includes the following steps of 1, sampling and sample pretreatment, 2, titrator presetting, 3, first-stage titration, 4, second-stage titration, 5, speed-regulation control quantity point post-titration and 6, data acquisition. The automatic titration method is a test method capable of accurately and scientifically judging the titration end point, the mode of setting speed-regulation control point and speed-regulation control quantity is adopted, and the refinement of the titration process is guaranteed; meanwhile, after the speed-regulation control quantity point is reached, a mode of dropwise adding and delayed judgment is adopted, so that the accuracy of the titration end point can be effectively guaranteed. A fully automatic mode is adopted for the automatic titration method, the influences, on the measurement result, of manual operation are avoided, and the measurement result is high in accuracy and good in repeatability; the automatic titration method can be used for rinse performance tests.