The invention discloses a speech recognition installation device. A combined structure of the invention can effectively improve the combination efficiency of a sound amplification segment to facilitate the operation of the sound amplification segment, can choose whether to assemble the sound amplification segment according to the need of use, and is low in space requirement to greatly save space and improve the user efficiency. A sound amplification receiving end is of a detachable structure. An upper panel, a left panel and a right panel after the sound amplification receiving end is detachedare attached to the outer surface of an installation box. A lower panel after the sound amplification receiving end is detached can slidingly cover a front opening of the installation box as a protective cover. In this way, a dust-proof effect of a speech recognizer can be effectively ensured. The arrangement of the protective cover and cleaning cotton of the invention can protect the interior and can provide a wiping and cleaning effect. The design of multiple extrusion components can quickly carry out installation and fixing, and the stability after the installation is high.