Student attendance is an important measure to cultivate students' good learning habits and improve students’ selflearning ability. The traditional way of sign in is write on paper, it might be checkinsbyproxy. In order to improve the quality of students and build a good style of study, the paper presents a convenient classroom attendance system based on STM32. The attendance system first uses the capacitive fingerprint sensor for fingerprint collection, and compares the acquired fingerprint with the fingerprint information in the fingerprint database, and then uploads the matching result to the host computer's attendance management system by Bluetooth. The system stores the data of students' attendance into the SQL database. Compared with the traditional time and attendance system, small size, low power consumption, more portable features. After the experimental test, the attendance system to meet the design requirements, with great practical value in College Students’ Attendance.