The invention provides a composite board, a
train body structure and a
maglev train. The composite board comprises a supporting framework and a first carbon
fiber layer which are located on one side of the supporting framework and fixedly connected with the supporting framework; a sound
insulation layer which is located on the side, facing the supporting framework, of the first carbon
fiber layer, and the sound
insulation layer is connected with the first carbon
fiber layer; and a second carbon
fiber layer which is connected to the side, away from the first carbon
fiber layer, of the sound
insulation layer. According to the composite board, the
train body structure and the
maglev train provided by the invention, the
carriage weight of the high-speed rail, the subway or the
maglev train can be effectively reduced, the weight reduction of the train body is facilitated, and the improvement of the running speed of the high-speed rail, the subway, the maglev train or
aerospace equipment is facilitated.