The invention relates to a movable and portable baby diaper changing platform which comprises a first platform arm, a second platform arm and a diaper changing platform body. The diaper changing platform body is foldably mounted between the first platform arm and the second platform arm. A first angle adjusting and locking device is arranged on the first platform arm and comprises a first knob, a first angle fixing plate and pipe clamp connectors, and a pipe clamp connection column is formed on each pipe clamp connector and penetrates a through hole in the first platform arm to extend into a first angle fixing plate through hole of the first angle fixing plate to realize rotational adjustment of the first platform arm. The first angle fixing plate is provided with a first guide groove, the first knob is connected to the connectors, and the connectors penetrate the first guide track groove to be abutted against the first platform arm to lock the position of the first platform arm. The diaper changing platform is wide in application range, portable and convenient for parents to change baby diapers, so that the problem of baby diaper changing is solved effectively for the parents going out.