This study aimed to examine the effects of maladaptive perfectionism and help-seeking on academic procrastination behavior among middle school students and to confirm whether help-seeking moderates the relationship between maladaptive perfectionism and academic procrastination behavior. A total of 295 middle school students (148 female, 147 male) in Gyung-gi province consisting of 98 freshmen, 98 sophomores, and 99 juniors, responded to a survey on academic procrastination behavior, maladaptive procrastination, and help-seeking. Hierarchical regression analysis was conducted to verify the moderation effect of help-seeking on the relationship between maladaptive perfectionism and academic procrastination behavior. Results indicated that (1) higher levels of maladaptive perfectionism was related to severe levels of academic procrastination behavior, and more help-seeking was related to less academic procrastination behavior. (2) The effect of maladaptive perfectionism on academic procrastination behavior differed according to help-seeking level. More help-seeking buffered the relationship between maladaptive perfectionism and academic procrastination behavior. These results called for developing and utilizing intervention programs to encourage students to seek help. Lastly, limitations of the study and suggestions for future research are discussed.