The utility model discloses a clamping type retarder which comprises a retarder cylinder body, a clamping type housing, a rail bottom clamp and a double-end fastening bolt, wherein a housing rail bottom clamping groove is formed in one side of the clamping type housing; a clamp rail bottom clamping groove is formed in the inner side of the rail bottom clamp; the housing rail bottom clamping groove and the clamp rail bottom clamping groove are matched with a rail bottom of a steel rail in shape; during mounting, the clamping type housing and the rail bottom clamp of the retarder are arranged on the two sides of the rail bottom of the steel rail respectively, and the double-end fastening bolt and a nut are connected and screwed down. According to the clamping type retarder, a mode that an existing retarder is connected with a rail web of the steel rail by the bolt during the mounting process of the retarder is changed, a mode that the clamping type housing is connected with the rail bottom of the steel rail by the bolt is adopted, and the damage to the steel rail and the connecting bolt is avoided; moreover, the mounting operation is convenient, a drilling tool is not required, supporting measures such as water supplying and power supplying are not required, the mounting speed is high, the construction cycle is short, and the interference on the transport cost is reduced.