The invention relates to a vital signs monitor which comprises a signal receiving and transmitting module, a data collecting card, a processing module and an alarming module. The signal receiving and transmitting module is used for generating continuous waves and radiating outwards as well as receiving target echoes and processing; the data collecting card is connected with the signal receiving and transmitting module and used for converting the analog signal acquired from the signal receiving and transmitting module into the digital signal; the processing module is connected with the data collecting card and used for processing the digital signal and transmitting a control command; and the alarming module is connected with the processing module and used for receiving the control command transmitted by the processing module. The vital signs monitor can be used without contacting the human body and causing discomfort to the human body, has a simple structure and low cost investment, is convenient and safe to use, adopts the manure technology and is suitable for market promotion and application.