Vehicle illegal parking monitoring device, monitoring system and monitoring method

The invention relates to the field of parking space monitoring, in particular to a vehicle illegal parking monitoring device, system and method. The vehicle illegal parking monitoring device comprises a panel, the panel is provided with at least three first reset rods located at a vertical angle, and a connecting shaft fixedly connected with the panel is arranged in the center of the lower portion of the panel; the trigger disc is fixedly connected with the connecting shaft; a first annular sliding groove is formed in the surface of the panel; the main board is provided with a switch hole penetrating through the main board; second reset rods with at least three vertical angles are arranged on the upper surface of the main plate; the number of the first pressure-bearing steel balls is at least three, and the at least three first pressure-bearing steel balls are located in the first annular sliding grooves respectively; the first reset rod and the second reset rod abut against the elastic belt. And the number o