Firmly-installed optical fiber adapter

The utility model belongs to the technical field of optical fiber adapters, and particularly relates to a firmly-installed optical fiber adapter, which comprises a shell, two optical fibers are sleeved on the side wall of the shell in a sliding manner, core wires are sleeved in the optical fibers, the two core wires are fixedly connected, a supporting cylinder is welded on the side wall of the shell, an optical fiber is sleeved in the supporting cylinder, and the supporting cylinder is welded on the side wall of the shell. A supporting cylinder is arranged in the shell, a gland is connected to the supporting cylinder through threads, an optical fiber is movably connected into the gland, a sealing groove is formed in the side wall of the supporting cylinder, a sealing sleeve is slidably connected into the sealing groove in a sleeved mode, a cushion block is welded to the shell, and a semicircular supporting plate is welded to the cushion block. According to the utility model, the supporting cylinder, the gland