Buffering device, engineering vehicle and buffering method of engineering vehicle

According to the buffering device, the engineering vehicle and the buffering method of the engineering vehicle, the buffering device comprises a driving assembly which is arranged between an auxiliary frame and a compartment, the driving assembly enables the compartment and the auxiliary frame to be switched between the contact state and the non-contact state, and the situation that the compartment is in contact with the auxiliary frame when the compartment and the auxiliary frame are in the non-contact state is relieved; impact of goods on a platform floor; and the sliding structure is connected between the auxiliary frame and the carriage, and in the non-contact state, the sliding structure allows the driving assembly to drive the carriage to move in the direction close to or away from the auxiliary frame. Therefore, when goods impact the carriage bottom plate, the carriage and the auxiliary frame can be kept in a non-contact state, rigid contact between the carriage and the auxiliary frame is avoided, impa