The invention discloses a compartment buffer mechanism during emergency braking of a motor home. A compartment is arranged on a sliding rail, a sliding groove is formed in the compartment, a sliding base is arranged inside the sliding groove, a sliding column is arranged on the sliding base, a base is arranged on a fixing baffle, and the relative faces of the sliding column and the base are slope faces; an elastic pipe expansion mechanism is arranged between the fixing baffle and the end face of the compartment. Compared with the prior art, according to the compartment buffer mechanism during emergency braking of the motor home, during emergency braking of the motor home, in order to prevent persons inside the compartment from being injured by inertia, the sliding column capable of moving inside the sliding groove is used for performing friction with the base, impact force brought by the inertia is converted to be transverse from longitudinal, the buffer displacement and space are increased, and the security of the persons inside the compartment is ensured.