Batik art in each region has its own characteristics that represent the culture of the community. Lasem Batik is one of the kind of coastal batik, which has a great influence on Chinese culture, thus making Lasem batik has its own distinctive characteristics compared to other areas. In the world of Lasem batik, there is a lexicon that reflects the batik's local wisdom. The lexicon that appears in this batik activity has an element of language that is very interesting. This research discusses the local wisdom of the batik community in Lasem which is reflected through the lexicon of written batik in Lasem. The purpose of the research are to describe the reflection of the local wisdom created by the batik makers in Lasem, including the lexicon of tools and materials, Lasem batik motifs, and batik process and coloring. The data collection techniques are done through the participatory observation, in-depth interview with the interview guidelines, and literature review. The qualitative data analysis was used by reducing data, presenting data, and drawing conclusion/verification. Data was then analyzed using the ethnoscience methods to find the local wisdom meaning. The results showed that the reflections of local wisdom in the lexicon of Lasem written batik as a reflection of the local community are (1) it reflects the ability of the people in Lasem to acculturate with other cultures, (2) it reflects the ability of the people in Lasem to adapt with the ecological nature, (3) it reflects the creativity of the people in Lasem, and (4) it reflects the ability of the people to follow the development of technology.