A flexible biomonitor comprises a flexible substrate, a circuit apparatus, a plurality of gauges, a RFID sensing chip, a micro-antenna, and a power supply. The flexible substrate has a plurality of through holes formed thereon. The circuit apparatus is electrically connected with the gauges via the through holes to sense and treat a physiological signal. The micro-antenna is electrically connected with the circuit apparatus to transmit this physiological signal. The power supply is designed to provide electric power. Thereupon the flexible biomonitor can be plastered on the skin where the human body needs to be monitored to achieve the purposes of reducing occupied area and providing comfortable wear. Besides, it is capable of remote real-time monitoring this signal to achieve the purpose of home care.