The invention discloses a movable pipeline installation assisting device. The movable pipeline installation assisting device comprises a one-way moving joint type mechanical arm, a conveying and transporting system, a lifting steel frame system, a conveying and connecting system, an enclosure structure and a fixable wheel train. The one-way moving joint type mechanical arm serves as a body and is matched with the conveying and transporting system and the conveying and connecting system, the pipeline position can be adjusted on an actual construction engineering project site, constructors are assisted in completing pipeline butt joint hoop groove pressing work, the labor cost is saved, the site wiring efficiency is improved, by adjusting the conveying and transporting system, the conveying and connecting system, the fixable wheel train and a lifting steel frame system, the height position can be flexibly changed along with the change of the construction site, and the assembly working efficiency of site wiring is improved. Through combined assembly of the one-way moving joint type mechanical arm, the conveying system and an elevator, the movable pipeline installation assisting device with a brand new using effect is achieved.