Ballistocardiography signal collecting system of improved structure

The invention provides a ballistocardiography signal collecting system of an improved structure.The signal collecting system comprises a ballistocardiography signal collecting and conducting device and an extremely-low-frequency vibration signal inductor; the ballistocardiography signal collecting and conducting device comprises a vibration collecting panel, a conducting piece and a base for supplying supporting and installing support for the vibration collecting panel, and the conducting piece is fixedly installed on the surface of the extremely-low-frequency vibration signal inductor; the extremely-low-frequency vibration signal inductor comprises a vibration receiving piece, a piezoelectric film sensing chip and a hollow support used or supporting the vibration receiving piece, and the vibration receiving piece and the support are connected in a matched mode so that the periphery of the vibration receiving piece can be uniformly supported by the support; a cavity B is formed by the bottom face of the vibra