The invention belongs to the technical field of buildings, and particularly relates to an assembling-type indoor decoration method. The assembling-type indoor decoration method includes the steps thatwater pipes, circuits and air pipes are laid, grooves are formed in wall surfaces, and the water pipes, the circuits and the air pipes are put into the grooves; a rail system is laid, transverse rails are laid on the ground and the roof, and vertical rails are laid on the wall corners or/and the wall surfaces perpendicular to the ground; the ground and the roof are decorated, grid frames are installed on the ground and the roof, and first decoration panels are fixed on the grid frames; the wall surfaces are decorated, second decoration panels are vertically fixed on the transverse rails, andmove along the transverse rails to change space; furniture is put or household appliances are installed, the furniture or the household appliances are installed on a lifting support, and the lifting supporting is fixed on the ground or the wall surfaces. The assembling-type indoor decoration method is simple and easy to achieve, efficient and rapid, the engineering quantity is reduced, engineeringtime is shortened, persons can rapidly check in, the cost is saved, space is changeable, using space is effectively increased, and user experience feelings are improved.