The invention discloses a construction method for installing a cement clinker production line kiln head drag chain conveyor steel truss. The specific technical scheme of the construction method includes that the total length of the kiln head drag chain conveyor steel truss is about 90m, the kiln head drag chain conveyor steel truss is produced in a three-section way that a third steel truss is installed, a second steel truss is installed and a first steel truss is installed, corridor sections are integrally spliced, construction of 'inverted installation method' is achieved, namely, the steel trusses are installed from top to bottom, the steel trusses are hoisted by the aid of large-scale hoisting machinery when constructed, the steel trusses are firstly hoisted to the position far away from the ground before officially being hoisted to finish trial hoisting, the distance between the hoisted position and the ground ranges from 200mm to 300mm, and complete inspection is performed in the trial hoisting process. The construction method has the advantages of high speed and good convenience relative to a traditional construction method, construction efficiency is improved, cost and safety risk in construction are reduced, and the construction method is highly worthy of popularization and application.