Detection device for integrity of existing foundation pile and detection method thereof

The invention relates to the technical field of foundation pile detection, and particularly discloses a detection device and a detection method for the integrity of an existing foundation pile, and a detection system comprises a vibration auxiliary device, an electric spark vibration source device, an electric spark ignition device, a low-strain dynamic tester, a first sensor and a second sensor, the vibration auxiliary device comprises at least two foundation pile clamping assemblies, and each foundation pile clamping assembly comprises a pile body hoop ring, a radial clamping plate located on the inner side of the pile body hoop ring and a connecting screw connecting the pile body hoop ring and the radial clamping plate. The number of the electric spark vibration source devices is the same as that of the radial clamping plates, and each radial clamping plate is provided with one electric spark vibration source device. The electric spark ignition device is electrically connected with the electric spark vibra