Vibration test device based on modal analysis and analysis method

The invention discloses a vibration test device based on modal analysis and an analysis method, and aims to solve the technical problem of operation complexity of simplifying modal analysis. Comprising a support conversion structure which is used for installing a tested part on a vibration test bench in a mode of simulating an actual working state through the vibration test bench, and is provided with a first connecting structure for connecting the support conversion structure with the vibration test bench and a second connecting structure for connecting the support conversion structure with the tested part; the first vibration detection device comprises a scanning type laser vibration meter arranged opposite to the detected part, and the surface of the detected part can be detected by the scanning type laser vibration meter, so that the vibration condition of the detected part is obtained through the scanning type laser vibration meter; and the second vibration detection device comprises a first acceleration