The invention discloses a specially-shaped special reducer and aims to provide the specially-shaped special reducer which is stable in work and long in service life. According to the technical scheme, the specially-shaped special reducer is mainly characterized by comprising a shell, a gear ring and a gear, wherein the gear ring and the gear are arranged in the shell; the shell comprises an upper shell body and a lower shell body, the upper shell body and the lower shell body form an installation cavity for storing the gear ring and the gear, the upper end and the lower end of the gear ring are integrally connected with a flange structure, and the flange structure is arranged outside the installation cavity and is in rotation connection with the shell through a bearing; the gear and the gear ring are engaged, the gear is connected with an input shaft, and the input shaft drives the gear to rotate and is in transmission with the gear ring and the flange structure; and the upper shell body is provided with an oil injection pipe, the oil injection pipe is provided with an oil injection opening and oil outlets, the oil outlets communicate with the installation cavity, and multiple oil outlets are formed and are distributed in the stroke path of the gear ring.