Learning Natural Sciences in Vocational Schools requires an assessment that emphasizes the scientific process and learning outcomes related to natural events around. But in reality until now science learning is still centered on the teacher and during learning more use textbooks and assessment only in the form of a written test at the end of the lesson. This results in low student performance skills and learning outcomes. One of the supporters who can practice the performance skills and student learning outcomes is a learning tool based on guided inquiry. This study aims to determine the appropriateness of guided inquiry-based science learning tools to practice vocational student performance skills. The device development is based on the Dick & Carey development research model so as to produce learning devices that are tested to the field test stage. The validity of the device is validated by experts, then in this observation also observes the activities of teachers and students, student responses, the influence of the use of learning tools, and student performance skills. The results showed that; (1) guided inquiry-based science learning tools are declared valid by experts, (2) teacher and student activities are categorized as good, (3) student responses show positive responses, (4) and there is an increase in student learning outcomes by 78.60% and Student performance skills improve with each meeting and have good criteria. Based on the results of a descriptive analysis of the learning tools developed it is said to be feasible and able to train performance skills.