A biodetection system is provided. The biodetection system includes: a monitoring device, a fixing frame disposed on a side of a detecting area, at least one antenna board disposed on the fixing frame, a transmitting device connected to the monitoring device, and a detecting device connected to the monitoring device through the transmission device. The detecting device is connected to the transmitting antenna of the antenna board through the antenna switch, so that the radar unit in the detecting device determines if there is a living body in the detection area according to the reflected signal transmitted from the antenna board by the antenna switch, if it is determined that the living body exists, a warning signal is transmitted to the monitoring device through the transmission device. The number or size of the antenna board may be adjusted according to the scanning range on the area to be detected, and the fixing frame may be disposed on one side or both sides of the area to be detected according to the scanning range.一種生物偵測系統，其包括：一監控裝置、一設於一欲偵測區域一側的固定架、設於該固定架上的至少一天線板、一用以與該監控裝置連接的傳輸裝置以及一透過該傳輸裝置與該監控裝置連接的偵測裝置。該偵測裝置透過天線交換器與該天線板中的發射天線以接收天線連接，使該偵測裝置中的雷達單元依據該天線交換器接收自該天線板傳來的反射信號判斷出該欲偵測區域存在生物體則透過該傳輸裝置傳出一警示訊號給該監控裝置。其中，該天線板的數量或大小可依據該欲偵測區域上的掃描範圍調整，另可依據該掃描範圍將該固定架設在該欲偵測區域的一側或兩側。
