For the automatic discrimination of checking the quality of physical index of college students, a design scheme of intelligent physical measuring instrument is proposed. Firstly, using STM32F103 microcontroller as the main controller, campus card numbers are displayed on the TFTLCD screen after swiping card by radio frequency module. Secondly, weight, height and vital capacity are measured by weighing sensors, ultrasonic sensors and vital capacity sensors. Thirdly, the physical data in the form of text messages is sent to the designated mobile phone by GSM module. In addition, the function of data wireless transmission can be achieved by using bluetooth module. Manmachine interaction is realized through the TFTLCD screen and bluetooth mobile phone client. Finally, the experiment demonstrates that the system runs extremely smoothly, realizes the diversitied function and to further strengthen that more attention should be paid to physical health of college students.