The invention relates to a constant-force fixing saddle of a thermal pipeline and a construction technique thereof. The constant-force fixing saddle of a thermal pipeline consists of two wheel-shaped brackets with the same structure; each wheel-shaped bracket consists of a constant-force plate, ribs and a supporting plate; the constant-force plates and the supporting plates are annular; a plurality of ribs are arranged along the annular rings in equal intervals between the constant-force plates and the supporting plates; the two ends of each rib are fixedly connected with the constant-force plates and the supporting plates. The construction technique is as follows: the two wheel-shaped brackets are cut into two semi-circular rings which are sheathed on the pipeline by along a central line, oppositely stick on the two side surfaces of a bearing structure by the supporting plates of each own and are welded with the pipeline; the two semi-circular rings of each own are correspondingly welded into a circular ring. The constant-force fixing saddle of a thermal pipeline has the advantages of being capable of meeting the paving demands for the thermal pipelines of large calibers; being capable of bearing a larger action force as the pipeline on the location of the fixing saddle is uniformly strained; besides, the fixing saddle can be pre-manufactured in a factory; the processing quality is better; the local construction is convenient.