The invention discloses a teaching auxiliary system based on smart phones. According to the system, a router, student cellphones connected with the router in a wireless manner, a computer connected with the router, and a display mechanism connected with the computer are arranged in a classroom. The teaching auxiliary system is advantageous in that a campus network is employed to connect the student cellphones to a multimedia teaching system, classroom interaction is facilitated, students can be prevented from being absorbed in the cellphones, class interest for students can be increased, students can actively participate in classroom teaching, and the teaching quality is effectively improved.