The permanent formwork fine aggregate concrete steel bar truss decking is a prefabricated assembly building component, which integrates steel bar trusses and non-removable formwork through factory prefabrication. After on-site laying, concrete is directly poured on it to form an integral stressed reinforced concrete floor slab. It is mainly applied to the floor and roof systems of steel structure buildings, suitable for various building types such as residences, industrial plants and commercial complexes. It greatly shortens the construction period, saves construction costs, improves quality stability and enhances building space utilization.