The present invention relates to a prefabricated optical cable connector and a welding-free optical fiber distribution case. The prefabricated optical cable connector comprises a prefabricated opticalcable adapter, a prefabricated optical cable plug and a prefabricated optical cable socket; the prefabricated optical cable adapter comprises a cylindrical base body with openings at two ends, radialprimary key grooves and a plurality of radial assistant key grooves are arranged at the inner sides of the two ends of the cylindrical base body at intervals in the circumference, a connection plateis fixedly arranged at the center of the inner side of the cylindrical base body, and the connection plate is provided with a radial T-shaped adaptive hole; the prefabricated optical cable plug and the prefabricated optical cable socket are the same in structure, and a P guidance needle is fixedly arranged at the front end of the high-density beam concentration optical fiber connector of the prefabricated optical cable plug; and the front end of the beam concentration optical fiber connector of the prefabricated optical cable socket is a P guidance hole matching with the P guidance needle of the beam concentration optical fiber connector of the prefabricated optical cable plug.