The invention discloses a horizontal double-head cold upsetting seat which comprises a hollow pipe body, wherein a through channel is arranged inside the pipe body and divided into a thimble cavity and cold upsetting cavities; inserts are embedded into walls of the cold upsetting cavities; the cold upsetting cavities are located at two ends of the pipe body; the thimble cavity is located at the middle portion of the pipe body and divided into three sections, namely, a thimble seat cavity at the middle section and thimble accommodating cavities at the two ends; and the sectional area of the thimble seat cavity is larger than the sectional area of each thimble accommodating cavity. A conventional cold upsetting seat is arranged to be in a double-head structure, so that the state of a thimble inside the cold upsetting seat is changed from a stationary state into a movable state; the double-head structure is arranged, so that bidirectional cold upsetting operation can be carried out in the cold upsetting seat; and by means of unidirectional cold upsetting action, an opposite workpiece is ejected out of the pipe body, so that the purpose of fully utilizing resources and utilizing the return time is achieved.