The utility model discloses a reducing elbow die and mainly aims at solving the problems that the existing reducing elbow processing technology is complicated and the processing efficiency is low. The reducing elbow die is characterized in that a die body (1) is formed by the buckling of two equally divided bodies, a straight hole section (2) and an arc hole section (3) of which the inner diameter gradually reduces are arranged on the die body (1), the straight hole section (2) is in clearance fitting with the outer diameter of a pipe blank (4), and the straight hole section (2) is smoothly transited to the arc hole section (3). The reducing elbow die has the advantages of simple structure, convenience in use, simplified processing technology and high processing efficiency.