The invention discloses an adjustable corner optical fiber winding box. The adjustable corner optical fiber winding box is composed of a multilayer winding reel, a dustproof cover, an angle adjuster and a base, wherein the lower portion of the base is connected with the angle adjuster, the multilayer winding reel is arranged on the upper portion of the base, the base and the multilayer winding reel are sleeved with the dustproof cover, the angle adjuster is composed of an angle adjusting rod, guide rail clamps, a radian ruler and an angle adjusting bolt, one end of the angle adjusting rod is connected to one side of the lower portion of the base in a pivoted mode through a pivot, the other side of the lower portion of the base is fixedly connected with the radian ruler, the other end of the angle adjusting rod is provided with a thread hole, and the angle adjusting rod is further fixedly connected with the guide rail clamps. By means of the adjustable corner optical fiber winding box provided with the base with the adjustable angle, optical fibers and standby cores in an intelligent station screen can be well laid and stored, safe operation of intelligent equipment is guaranteed, and stability of an intelligent power grid is maintained.