This letter improves the Personal Location Beacon( PLB), designs and implements a prototype personal maritime emergency radio beacon. Unlike the existing PLB, it is compatible with the traditional global search and rescue system( COSPAS-SARSAT) and BeiDou search and rescue system, the vital signs of people monitoring and reporting functions. After the PLB transmits distress information, the Beidou receiver works. The Beidou receiver receives information from the Rescue Centre and controls whether the PLB transmits the distress information again, reducing unnecessary emissions, thereby reducing the average power consumption of the PLB and extending the working time of the PLB. Measurements show that the current is 79mA in the state of receiving Beidou information, and the 7000mAh 7.4 V lithium battery can send distress messages to COSPAS Rescue Centre and Beidou Rescue Centre 200 times each, and the distress message contains the vital signs of people in distress. The vital sign is the temperature information. Ideally, the 7000mAh 7.4V lithium battery can support the continuous working time of the market for 48 hours.