The pressure information collection of bridge buildings is important to monitor the healthy status of the bridge buildings. For the defects of traditional pressure information collection system, the paper designs a system for collecting the pressure information of bridges based on the IoT. To meet the demand of real time, the system sends the pressure information collected by pressure sensors to the data processing center through the CAN bus. Before storing the pressure information into the database, the system will fill the incomplete pressure information to provide the bridge experts with useful information. Simulation experiments show the system can collect the pressure information of bridges in real time and meet the demand of bridge experts.