The invention discloses a combined type deformation ruler. The combined type deformation ruler comprises a deformation ruler body, wherein the deformation ruler body comprises triangular blocks and rectangular blocks; the triangular blocks include a triangular block a, a triangular block b, a triangular block c, a triangular block d, a triangular block f, a triangular block g, a triangular block h, a triangular block i, a triangular block j and a triangular block k; the rectangular blocks include a rectangular block, a rectangular block b, a rectangular block c and a rectangular block d; a first connecting mechanism, a second connecting mechanism, a third connecting mechanism and a fourth connecting mechanism are arranged on the deformation ruler body; the triangular block c, the triangular block g, the triangular block k and the triangular block j are pairwise movably connected through the first connecting mechanism. According to the combined type deformation ruler, a straight ruler and a triangular ruler are detachably combined through the connecting mechanisms to realize different shapes for fitting different conditions, thus the applicable scope is expanded, and moreover, the interest of a user in use can be improved.