The purpose of this paper was to investigate and compare the knowledge, attitude, and participation of primary school students before and after waste recycling bank  promoting. The sample group included 50 Grade5-6 students from Samakkiwittaya municipality school, selected by the purposive sampling method. The research tools were a manual for waste recycling  bank promoting in school, a waste recycling bank knowledge test, an attitude questionnaire, and a participatory questionnaire. The data were analyzed by using percentage, mean, standard  deviation and paired t-test. The findings were that mean score of the waste recycling bank knowledge after the promotion was significantly higher than before the promotion at the significance index of .05.  In terms of attitude, the students was first uncertain about the effectiveness of the waste recycling bank before the promotion but after the promotion, they agreed with the idea of waste recycling bank. When comparing the mean score of the attitude before and after the promotion, it was found that the students had more positive attitude towards the waste recycling bank after the promotion with the significance index of .05. For the participation after the promotion, most students were willing to participate in the waste recycling bank activities.