This research purposed to identify slip of the tongue in student’s speech. This research implied descriptive qualitative method. The data collection technique used was observation. This research data was taken from student’s speech. The data analysis technique is applied in this research related to Miles and Huberman proposed three stages namely data coding, data reduction, and drawing conclusion. There are the following theories of slip of the tongue used in this research is proposed by Carrol (2008) and Fromkin (1973) that categorizes slip of the tongue into eight types that those are anticipation, perseveration, reversal, blend or haplologies, misderivation, substitution, addition, and deletion. The analysis result of this research dealing with types of slip of the tongue occurred in students’ speech showed that there was one of types of slips of the tongue that could not occur in students’ speech. As the frequency result showed that slips of the tongue occurred twenty nine times in student’s speech. One type of slips of the tongue did not occur in the student’s speech that was anticipation phase. On the other hand, the most types of slips of the tongue frequently occur until nine times that was substitution phase. By those finding, the researcher argues that English teachers need to strengthen students’ speaking skill by paying attention types of slips of the tongue so that in daily communication slips of the tongue can be avoided in their utterance.