The invention relates to an optical fiber adapter. The optical fiber adapter comprises: a transfer terminal, wherein the transfer terminal is provided with a protruding positioning portion, one side of the positioning portion abuts against a first ceramic core, and the other side of the positioning portion abuts against a second ceramic core; a locking bracket, wherein the locking bracket is arranged at the outside of the first ceramic core in a sleeving manner, and cooperates with the positioning portion to limit the first ceramic core, and a groove for detaching the locking bracket is formedin an end part deviating from one side of the positioning portion; an upper shell for connecting a plug, wherein the locking bracket is detachably fixed in the upper shell; and a lower shell for connecting the plug, wherein the lower shell cooperates with the positioning portion to limit the second ceramic core. The optical fiber adapter provided by the invention can effectively solve the problems of optical fiber abrasion and easy replacement, greatly prolong the service life of the product, and facilitate the field work.