The invention discloses a vibration test fixture and an installation method thereof. The vibration test fixture comprises an overall frame; a tested product is installed on the overall frame; the overall frame is of a beam type structure of which the upper part, front part, left part and right part are open; the overall frame includes a base assembly which provides bottom support for the tested product, and a back assembly which is arranged at the upper part of the base assembly and provides back support for the tested product; the tested product is fixedly connected with the base assembly and the back assembly; the vibration test fixture also comprises damping devices arranged on the base assembly and the back assembly; and the tested product is fixedly connected with the base assembly and the back assembly through the damping devices. With the vibration test fixture and the installation method thereof of the invention adopted, the technical problems of high material consumption, low strength, low rigidity and poor vibration reduction performance of an existing vibration test fixture can be solved.