Aim at the two major problems of current object flow information collection which can not take multi-point monitoring and distinguish object type, this paper designs a system of object flow information collection based on WSN. The system is composed of the monitor nodes, the base depot node and the superior machine. The monitoring nodes send the monitored data to the base depot node through a chain topology structure. And then the data are sent to the superior machine. The superior machine will take traffic statistics and data analysis according to the data. This system can realizes multi-point monitoring and distinguishing object type with no any auxiliary labeling. It has broad application prospects.