The invention relates to a multivalve type pipeline elbow insulating casing in the field of insulating pipes in nuclear, thermal power, steel and chemical industries. The complete multivalve type pipeline elbow insulating casing is formed in a manner that two multivalve type elbow casings are integrally folded. The multivalve type elbow casing is formed by splicing a multivalve forming board A and a multivalve forming board B, raised ribs are pressed from two end edges of the forming boards A and B, the forming boards A and B are positioned and fixedly connected by the raised ribs when in splicing. The multivalve type elbow casing is a semicircular casing, while a 10mm-20mm vertical lifting edge is arranged by extending from the edge of the multivalve elbow casing in order to stably connect the two semicircular multivalve elbow casings to form a whole, thus facilitating the positioning after the two multivalve type elbow casings are folded, as well as fixed connection of a fastener. The multivalve type pipeline elbow insulating casing is reasonable in design, convenient to install in construction field, can be repeatedly used, and can improve the thermal efficiency of an engineering pipeline.