This research is entitled "Register for Sale and Purchase of Animal Feed at the Wonosobo Main Market as a Reference for Learning Indonesian Negotiation Texts". This research describes the form and function of registers that exist in the sale and purchase of animal feed at the Wonosobo Main Market, and its use as a reference for learning Indonesian negotiating text ”. This research is a descriptive qualitative research. The data in this study are utterances that appear in the sale and purchase of animal feed in the Wonosobo Central Market and contain registers. The registers are in the form of words, phrases, abbreviations and acronyms. There is a register of basic word forms totaling 12 words, registers of affixed word forms totaling 5 words, registers of compound form words totaling 3 words, registers for rephrase forms totaling 1 word, registering for phrases totaling 1, registering for abbreviations totaling 5, and registering for acronym forms totaling 1. Each of these registers has a unique meaning and is known only in the sale and purchase of animal feed. The data obtained can be used in learning negotiation text in class X Senior High School in KD. 3.10 namely evaluating submissions, offers and agreements in oral and written negotiation texts.