The strong hope of realizing a just, advanced, and prosperous Sambas community is an ideal that has been embedded for a long time, especially after the Madurese and Malay Ethnic Conflict in Sambas Regency in 1999. In an effort to help realize this goal, the writer feels the needs to conduct research on this subject matter with the main problem discussed in this article that are divided in to what factors that cause inter-ethnic conflict in Sambas and to then analyze the new construction of the legal culture of the society that was developed by the Madurese and Sambas Malay ethnicities in order to further increase the conflict recovery based on the value of justice. This study uses a constructivism paradigm with a socio-legal research approach. The results showed that the ethnocentric and exclusive attitude of the Madurese ethnic group made social interactions with the Sambas Malay ethnic destructive, in the form of a social conflict that ended with the expulsion of the Madurese ethnicity from Sambas Regency. This is exacerbated by differences in origins, cultural values as the basis for differences, also due to the ethnocentric and exclusivistic character of the Madurese as a trigger for conflict, and the weak rule of law as a factor that further widens the life gap between the two ethnic groups where in this case, is a new reconstruction of legal culture, that the Madurese ethnic needs to reposition cultural values in the context of adaptation/adjustment, so that they can be accepted back in Sambas Regency, because they are able to adapt socially and adapt, in the form of multiculturalism education for basic education and middle school, Islamic boarding schools, and aculturation in a form of marriages between Madurese and Dayak as the People of Sambas.