A method for manufacturing an input assembly, an input assembly and a terminal are provided. The input assembly includes a reinforcing plate, a first flexible circuit board, a fingerprint chip package structure and a fixed plate. The reinforcing plate has a first positioning structure and configured to reinforce the first flexible circuit board and the fingerprint chip package structure. The first flexible circuit board is fixed on the reinforcing plate. The fingerprint chip package structure is fixed on the first flexible circuit board. The fixed plate is fixed to the terminal and has a second positioning structure. The first positioning structure is configured to be fitted with the second positioning structure, so as to limit a movement of the reinforcing plate relative to the fixed plate.