The invention discloses a parking space monitoring device, an array, a vehicular device and a vehicle management method. The parking space monitoring device comprises four first transmission modules corresponding to a same parking space; each first transmission module with unique identification information is used for sending the identification information outwards through preset-frequency signals. The vehicular device comprises a second receiving module and a detection module; the second receiving module is used for receiving the identification information transmitted by the first transmission modules of the parking space monitoring device or the array of the parking space monitoring device through the preset-frequency signals; the detection module is used for in-place detection of vehicles according to signal intensity and the identification information received by the second receiving module. By adoption of the technical scheme, the novel parking space monitoring device, the array, the vehicular device and the vehicle management method are provided.