The invention provides a distributed preserving system, which comprises a plurality of sensing devices, a main system and a plurality of robots, wherein the sensing devices are arranged in the environment and send the measured environment information to the main system. The main system can assign the robot which can reach the occurring position of abnormality in the shortest time and monitor whenthe main system judges the occurrence of the abnormality based on the environment information. The shortest time is computed out according to the relevant displacement distance of the robot and the sensed position and the highest moving speed of the robot. By adopting the distributed preserving system, when a plurality of sensing devices are abnormal, the main system commands a plurality of robots to move there and process so as to achieve the effects of providing more rapid and safer preserving service and further reducing occurrence of danger.