In this experiment, based on the implicit association test (SC-IAT) method, it researched and investigated 44 college students about the implicit attitude of garbage clasification in order to reveal the recognition of college students on garbage classification and their self-attitude. The results showed that there was a huge difference between the overall recognition attitude of college students on garbage classification and the overall disapproval , in which the general identification attitude response was significantly lower than the general disapproval of attitude response; while there was no significant difference of the emotional identity response. and there was a significant difference of behavioral identity response , in which the behavioral identity response was significantly lower than the behavioral disapproval response. Besides, there was a significant difference in the self-identification response to the garbage classification, and the self-vocabulary recognition response was lower than that of other people's vocabulary recognition response. And finally, it has been concluded that college students show the general attitude of approval on garbage classification, which is specifically reflected in their behaviors and self-identifications.