Vehicle-mounted equipment, communication method thereof and train-control train-ground wireless communication system

The invention discloses on-board equipment, a communication method thereof and a train control train-ground wireless communication system. The vehicle-mounted equipment comprises a vehicle-mounted host and two control groups; each control group comprises a wireless control module, a radio station adaptation module and a radio station. The vehicle-mounted host determines target ground equipment to be connected, selects one radio station adaptation module as a target radio station adaptation module, and sends a connection establishment request to the target radio station adaptation module through the wireless control module in the same group of the target radio station adaptation module, and the connection establishment request carries IP address information of the target ground equipment; and if any radio station adaptation module receives a connection establishment request, establishing a first packet domain wireless connection through the first radio station based on one IP address of the target ground equip