This study aims to analyze the management of work discipline in improving teacher performance. This research use desciptive qualitative approach. The subject of this research is the Head of Madrasah. Informants of this study are teachers. Data collection techniques using observation, interviews, and documentation. Checking the validity of the data using source and method triangulation. The data analysis technique uses an interactive analysis model, which consists of data reduction, data presentation, and drawing conclusions. The results of this study can be concluded that: at MTs Al Islamiyah Balorejo Bonorowo in implementing preventive discipline teacher performance has been carried out since the inception of MTs Al Islamiyah Balorejo Bonorowo, while corrective discipline has also been carried out, but the punishment given is not so burdensome in the sense that it is still just reprimand. Meanwhile, corrective discipline at MTs Al Islamiyah Balorejo Bonorowo so far has only served as a reference, a reference to make teachers more disciplined. At MTs Al Islamiyah Balorejo Bonorowo in carrying out discipline obeying the rules and performance penalties are always applied because it is a rule that must be carried out by all teachers and employees at MTs Al Islamiyah Balorejo Bonorowo in order to improve discipline.