This research was carried out to describe the influence of the implementation of Project-Based Learning (PjBL) on students’ collaboration skills. This experimental method used a mental experiential design. The sample was divided into non-random or nonrandom-based research groups. The research was conducted at the Faculty of Teacher Training and Education of Universitas Muhammadiyah Surabaya on students who were taking the compulsory course of Indonesian in the first semester. The data collection techniques were carried out by using pretests, posttests, and observation sheet instruments to observe student collaboration skills. Analysis of the description included the average and standard deviation. Before the data was tested statistically, it is necessary to conduct prerequisite tests, namely normality and homogeneity tests. Furthermore, the MANOVA statistical analysis technique was carried out. From the discussion, it can be concluded that value F counts 27.028 with a significance of 0.000. Thus, there was an influence of the project-based learning model on the difficulty of collaborating with students. Therefore, it can be argued that Ho was rejected, which means that there is a significant influence on collaboration skills. Thus, the hypothesis was stated to be proven. The results of the data calculation were that there was an influence of the project-based learning model on the skill of collaborating students.