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In order to realize the automatic management of the physical condition to the elderly with myocardial infarction and reduce the pressure of guardianship on the special human, a real-time monitoring system for the elderly is designed. This system is controlled by Arduino and the 32-bit stm32F103 microcontroller. ADS1292 and LMT70 sensors is used to collect potential voltage data. The voltage data is converted to heart rate and temperature value by AD convertor, the amplification and signal processing circuits. ESP8266 wireless transmission module is used to transfer data to the server and transfer data to OLED display terminal based on establishing the TCP connection. The designed system can transmit the elderly's physical condition information to the guardian's mobile phone APP， effectively prevent the accident of no taking measures timely when the guardian is not in bed escort. The experiment shows that the heart rate measurement accuracy as high as 95.29%, body surface temperature measurement accuracy as high as 99.937%. The test results indicate that the designed system has high degree of accuracy and reliability, and has practical popularization and application value.