The invention discloses a synthesized test bed of composite structure, which is characterized in that a vibration exciter is fixed on a test bed; one end of a delaying vibration rod is inserted into the vibration exciter hole and the other end thereof is connected with one end of a cross beam at the end of the vibration exciter; a platform on which a guide way is installed is positioned at one side of the test bed; a cross beam at the end of a slide block is vertical to the guide way; one end of the cross beam at the end of the slide block is fixed on a slide block connecting plate and is connected with the cross beam at the end of the vibration exciter or a mass block by a cross beam connecting plate; four piezoelectric patches or ferroelectric patches are respectively pasted at the two sides of the cross beam connecting plate to form piezoelectric or ferroelectric composite structure; and two displacement sensors are installed on supports at the two sides of the cross beam connecting plate respectively and are ensured to accurately receive the vibration signals received by the piezoelectric patches or ferroelectric patches; the vibration exciter drives the surfaces of the piezoelectric patches or ferroelectric patches to generate charges; the displacement sensors receive the vibration signals received by the piezoelectric patches or ferroelectric patches; and an upper computer utilizes a data acquisition system to acquire the vibration signals and the charge signals in real time for experimental study.