The invention discloses a parking guiding system for a stereo garage. The parking guiding system includes a monitoring center, a garage system, and a mobile terminal device, the monitoring center monitors the garage operation condition and guides a vehicle to find a parking space, a client sends the parking space searching information via a mobile terminal, the monitoring center gives the client the latest garage information and the remaining parking space information, the garage system uploads the data information acquired by a detection unit to the monitoring center, the detection unit includes a vacancy detection device and an abnormality detection device, and the monitoring center is in wireless connection with the mobile terminal via the Internet. The monitoring center is arranged to monitor the operation of the garage, the human resources are reduced, and the operation cost is reduced, the monitoring center guides vehicles to find the parking spaces, clients can conveniently search the parking spaces, and the time is saved for the clients; moreover, by means of the monitoring unit and detection unit, the monitoring center knows the condition of the garage in real time, the later real-time supervision and maintenance is facilitated, and the personnel' lives and property can be protected via an alarm device.