The invention provides an unattended parking lot management method. The method includes the following steps that firstly, two-dimension code labels are arranged at the entrance and the exit of a parking lot respectively; secondly, the two-dimension code label at the entrance is scanned by a mobile terminal and the mobile terminal has access to a server of the parking lot; thirdly, the server distributes target parking spaces; fourthly, the server sends a parking lot map and target parking space information; fifthly, a navigation path from the current entrance position to a target position is generated on the parking lot map; sixthly, a car is parked into one target parking space according to the navigation path; seventhly, the two-dimension code label at the exit is scanned and the car leaves the parking lot after a car owner pays for parking. By the adoption of the technical scheme, car owners can be guided to unoccupied parking spaces when entering the parking lot to park cars and can be helped to quickly find the parking spaces where the cars are parked when looking for the cars to leave the parking lot, so that the time consumed in parking the cars and looking for the cars is shortened for the car owners, and the operating efficiency of the parking lot is improved as well; meanwhile, by the adoption of the mobile payment mode, workers are not needed, and the operating cost of the parking cost is reduced.