To provide a method for manufacturing three-dimensional fiber-reinforced structure with long fibers capable of solving disadvantages in durability and strength of an autoclaved lightweight cellular concrete panel by incorporating the three-dimensional fiber-reinforced structure of long fibers with tensile force into the entire inner part of the autoclaved lightweight cellular concrete panel.

The method for manufacturing three-dimensional fiber-reinforced structure with long fibers includes stacking and holding net formworks of long fibers with tensile force to the inner side of the formwork, constituting the three-dimensional fiber-reinforced structure of long fibers with tensile force within a filling space, and incorporating the three-dimensional fiber-reinforced structure of long fibers with tensile force into the entire inner part of the autoclaved lightweight cellular concrete panel in a process for assembling of the formwork which makes a space filling a cement paste.