Letters written in Dongba script are an important type of social documents in Dongba script. Two letters written in Dongba script to scholars have been published and translated before, but no letter of thanks written in Dongba script has been disclosed so far. This article interprets a recently written thanks letter in Dongba script, which can supplement the deficiency of such literature. From the contents of the thanks notes, it can be seen that Dongba culture has been revived in some places. In addition, some unusual writing forms of Dongba graphs appeared in this document, which can be used to supplement Dongba reference books when they are revised.