On 5 June 1981 the minor district Chai Buri was created by splitting off tambons Song Phraek and Chai Buri from the Phrasaeng District. The name was chosen in honor of Khun Chai Buri, the first district officer of Phrasaeng. The minor district started operation on 10 September 1981 with a temporary office in a sermon hall of the temple, Wat Samai Suwan, tambon Song Phraek. Wisut Tansutthiwanit became the first leader of the minor district. In 1983 the ministry of interior had chosen two plots of land for the district office building, one in tambon Song Phraek and one in tambon Chai Buri. Though originally the first location was the preferred one, the leader of the minor district, Napha Kanchonkirana, recommended the second site, as the first was prone to flooding and was also not at the center of the district. In July 1984the office building in tambon Chai Buri was opened. On 4 July 1994 the minor district was elevated to a district. Niphan Chonwit became the first district officer.
Land dispute
The 70-family village of Klong Sai Pattana in Chai Buri District has battled Jiew Kang Jue Pattana Co Ltd, a neighbouring palm oil grower, since 2005 over land ownership. For years, the company has occupied a 217 ha palm oil plantation surrounding the village. In 2005, the company was sued by the Agricultural Land Reform Organisation, a Thai governmental entity whose mandate includes illegal encroachment. A provincial court found for ALRO in 2007, but Jiew Kang Jue Pattana filed numerous appeals until 2014, when the Thai Supreme Court handed ALRO a victory. In 2010, a Klong Sai Pattana villager was murdered by sniper gunfire. Two female villagers were killed in 2012, and a fourth village in 2015. Villagers believe that the gunmen were hired by the palm oil company to intimidate villagers, driving them away. the village has not received a title to the disputed land, no one has been held accountable for the murders and intimidation, and the Jiew Kang Jue Pattana Company still cultivates palm trees on the plot in spite of their being found guilty of illegal trespass.
Administration
The district is divided into four sub-districts, which are further sub-divided into 37 villages. There are no municipal areas. Each tambon is administered by a tambon administrative organization.