Portable foundation pile low-strain detection excitation device

The utility model relates to the technical field of foundation pile detection, in particular to a portable foundation pile low-strain detector excitation device which prevents a hammer from being lost, keeps the knocking force of each time consistent, reduces the knocking frequency and improves the working efficiency. Comprising two square frames, a plurality of folding arms, four supporting legs, a low-strain detector, two vertical plates, a turning plate, two plug pins, a hammer handle insertion pipe, a tension spring, a limiting pin and a hammer, the folding arms are rotatably connected with the inner side walls of the two square frames, the supporting legs are slidably installed in sliding grooves of the two square frames respectively, the low-strain detector is installed on the square frames, and the vertical plates are arranged on the turning plate. The two vertical plates are installed on the other square frame, the turning plate is rotationally connected with the two vertical plates through rotating s