A kind of bone density detection device, the analytical unit of the control unit for tapping unit, a sensing unit, the electrical connection what percussion unit and sensing unit comprising one and an electrical connection what control unit. The analytical unit receives the percussion unit and taps the percussion signal that bone one end generates,And the sensing unit is by received reaction signal Hou of the bone other end,It analyzes the percussion signal and reacts the time difference of the starting point of signal； In addition,Present invention simultaneously provides a kind of bone density detection method,Using the time difference obtained,And cooperate the one end for tapping the bone and sense the distance between the other end of the bone,And a velocity coefficient is generated,The bone density of testee is judged with the velocity coefficient,When the velocity coefficient is bigger,Then the bone density of the testee is bigger.一種骨質密度檢測裝置，包含一敲擊單元、一感測單元、一電連接於該敲擊單元與感測單元的控制單元，及一電連接於該控制單元的分析單元。該分析單元接收該敲擊單元敲擊骨頭一端產生的敲擊訊號，及該感測單元由骨頭另一端接收的反應訊號後，分析該敲擊訊號及反應訊號之起始點的時間差；另，本發明同時提供一種骨質密度檢測方法，利用所獲得的該時間差，並配合敲擊該骨頭之一端和感測該骨頭之另一端之間的距離，而產生一速率係數，以該速率係數判斷受測者的骨質密度，當該速率係數越大，則該受測者的骨質密度越大。
