The invention relates to a hot-melt field-assembled optical fiber connector. The connector comprises a front bracket, a connecting bracket, a ferrule, an optical fiber protector, a prefabricated optical fiber, a user side optical fiber, a heat-shrinkable protective tube, a rear bracket assembly, a screwing rear seat, an inserted core assembly and a spring. The connector has the following advantages: 1) the connector can be reused twice, thus increasing the assembly success rate, saving the field assembly time and lowering the cost; 2) the defect that the properties of the optical fiber quick connector are poorer because the bending radius of the optical fiber is insufficient, which is caused by insufficient length of the additional section, is overcome, and as the additional section of the optical fiber is the prefabricated optical fiber, the anti-bending optical fiber can be used, the bending radius is smaller, the additional section of the optical fiber can be shorter and the whole length of the optical fiber connector is reduced; 3) the optical fiber additional section welded twice is preposed, so the front end of the connector is a whole; and 4) the internal structure is suitable for various types of hot-melt field-assembled optical fiber connectors such as SC and LC and 0.25mm and 2.0mm optical cables.