The invention discloses a changeable spatial combined partition wall, which comprises a track group, a rolling ball component, a rotatable connecting piece and a partition wall group, wherein the track group is arranged on a floorslab, and comprises a transverse track and a longitudinal track which are mutually vertical to each other and are correspondingly communicated with each other, and a first rolling groove and a second rolling groove are formed in each of the transverse track and the longitudinal track; rabbets of the first rolling grooves and the second rolling grooves are arranged upwards and the cross sections of groove bodies are in an arc shape, each first rolling groove and the corresponding second rolling groove are parallel to each other, and a first clearance is reserved between the first rolling grooves and the second rolling grooves; the rolling ball component comprises a shell and four rolling balls, and four semispherical grooves for accommodating the rolling balls are formed in the shell; rabbets of the four semispherical grooves are arranged downwards, and the distances between every two adjacent rolling balls are equal; a connecting rod is extended from the shell corresponding to a gap among the four rolling balls, and a tray is connected onto the connecting rod and is in a cylindrical shape; the rotatable connecting piece is in a hollow cylindrical shape, the upper end of the rotatable connecting piece is provided with a horizontal surface, and the lower end of the rotatable connecting piece is an opening end; a second round hole is formed in the horizontal surface.