The invention relates to the technical field of track vehicles, in particular to a track vehicle and a balance weight device. The balance weight device comprises a balance weight, an elastic body and a base fixedly connected with a track vehicle body. The balance weight is connected to the base through the elastic body. According to the balance weight device under the structure, the two functions of track vehicle balance weight and track vehicle gravity center position adjusting are achieved, meanwhile, and another key factor for improving the stability and the comfort of track vehicle running is added, namely the absorbing effect of vibration. Compared with the prior art in which a balance weight device only has the effects of vehicle balance weight and gravity center position adjusting, the running stability and the comfort of the track vehicle can be obviously improved.