The invention relates to an ultra-high-voltage direct current by-pass switch anti-seismic performance testing device. The device comprises an ultra-high-voltage direct current by-pass switch, a vibration generator and an acceleration measurement assembly, wherein the ultra-high-voltage direct current by-pass switch comprises a supporting pillar, suspension arms, and elastic bases and further comprises a control cabinet, the output end of the vibration generator is connected with vibration receiving ends of the elastic bases, and the acceleration measurement assembly comprises first accelerometers, second accelerometers and third accelerometers. Through the arrangement of the vibration generator and the acceleration measurement assembly, when the vibration generator is started, the first accelerometers, the second accelerometers and the third accelerometers collect acceleration data of the suspension arms, the supporting pillar and the elastic bases respectively, through the analysis ofthe acceleration data, the anti-seismic performance of the ultra-high-voltage direct current by-pass switch is obtained, the elastic bases play an effect of buffering vibration, and can also lower the interference of nonlinear vibration in the acceleration measurement assembly, the precision of data collection is improved, and the reliability of testing data and analysis results is improved.