The utility model provides a MPO optic fibre socket, it is main including MPO adaptation head, casing on the socket, casing and MT lock pin subassembly under the socket, casing one side is equipped with the adaptation groove that suits with MPO adaptation head under the socket, be provided with the location boss in the adaptation groove, the MPO adaptation top of the head is settled a boss and is arranged the adaptation groove in, the casing opposite side is equipped with positioning channel section under the socket, the casing is equipped with the casing boss on the socket, MT lock pin subassembly is placed the casing boss in and is coordinated the die cavity of forming with positioning channel section, the casing is opened on the socket has the counter sink, bore threaded through -hole under the socket on the casing, during installation, the screw pierces the screw thread through -hole through the counter sink, it is even as an organic whole with casing under casing on the socket and the socket. The utility model discloses rationally setting up adaptation groove and boss and installing the location, the floated design of MT subassembly has reduced the butt joint effort. Compared with the prior art, the utility model discloses small, simple structure, the reliability is high, clean easy maintenance.