Safety system of stereo parking garage

The invention provides a safety system of a stereo parking garage. The safety system of the stereo parking garage comprises mobile parking spaces, portals, safety isolating devices, a top platform, a lift car guide rail, a lift car, a horizontal guide rail and a transmission mechanism, wherein the portals are fixed to the mobile parking spaces; each safety isolating device is arranged between the corresponding mobile parking space and the corresponding portal; and the number of the mobile parking spaces is twelve or over, and the mobile parking spaces are of a movable combined structure. By means of the safety system, car owners can go back and forth between the floor and parked cars through an elevator, so that time is greatly saved, the situation that in order to take or place objects, people have to move the cars and consequently various inconveniences are caused is avoided, the car owners can go back and forth between the floor and the cars directly, and efficiency is greatly improved. Meanwhile, safety of all the cars in the stereo parking garage is ensured, the car owners can enjoy the full sense of safety as private parking garages, lawbreakers cannot easily steal any cars parked in the stereo parking garage, and the car owners do not need to worry about that the own cars are scratched but relevant people in charge cannot be found.