Pile top and hole interior double measure point low strain integrity detection device and method of foundation pile

The invention discloses a pile top and hole interior double measure point low strain integrity detection device and a pile top and hole interior double measure point low strain integrity detection method of a foundation pile. The pile top and hole interior double measure point low strain integrity detection device of the foundation pile comprises an acceleration sensor, an embedded pipe, an air sac fixing device, an air inflation pipe, an air stopping valve, an air inflation device, a balancing weight, a sensor lead with calibrations and a data collection and processing device. The pile top and hole interior double measure point low strain integrity detection device of the foundation pile uses the acceleration sensor which comprises a pile top sensor and a hole interior sensor, wherein thepile top sensor is placed at the pile top of the foundation pile, the hole interior sensor is hung in the foundation pile through the embedded pipe, and after the hole interior sensor arrives at a designated position, the po