A foldable miter saw, comprising: a base unit comprising a front edge , a rear edge opposite to said front edge , a bottom wall extended from said front edge to said rear edge , and a top wall opposite to said bottom wall ; a worktable mounted at said base unit , said worktable comprising a working surface disposed opposite to said bottom wall and corresponding to said top wall and an axle holder facing toward said rear edge and connected to said working surface , said axle holder comprising an axis (L1) disposed in parallel to said working surface and extending from said rear edge toward said front edge ; and a cutting unit comprising a support arm pivotally connected to said axle holder of said worktable and biasable relative to said base unit and said worktable , a saw blade mounted at said support arm , and a driver mounted at said support arm and adapted for driving said saw blade to rotate, said saw blade comprising a first end face and a second end face opposite to said first end face , characterized in that the support arm is turnable about said axis (L1) to pivot the saw blade between working positions within a contained angle of 90° to 45° formed between the saw blade and the worktable , wherein, said support arm is further turnable about said axis relative to said base unit and said worktable to convert said cutting unit from said working positions to a folded position; in the folded position, the saw blade is outside the contained angle of 90° to 45° and said second end face of the saw blade is located in proximity to said working surface and facing toward said working surface , and wherein, the support arm is lockable in said working positions and in the folded position. a base unit comprising a front edge , a rear edge opposite to said front edge , a bottom wall extended from said front edge to said rear edge , and a top wall opposite to said bottom wall ; a worktable mounted at said base unit , said worktable comprising a working surface disposed opposite to said bottom wall and corresponding to said top wall and an axle holder facing toward said rear edge and connected to said working surface , said axle holder comprising an axis (L1) disposed in parallel to said working surface and extending from said rear edge toward said front edge ; and a cutting unit comprising a support arm pivotally connected to said axle holder of said worktable and biasable relative to said base unit and said worktable , a saw blade mounted at said support arm , and a driver mounted at said support arm and adapted for driving said saw blade to rotate, said saw blade comprising a first end face and a second end face opposite to said first end face , characterized in that the support arm is turnable about said axis (L1) to pivot the saw blade between working positions within a contained angle of 90° to 45° formed between the saw blade and the worktable , wherein, said support arm is further turnable about said axis relative to said base unit and said worktable to convert said cutting unit from said working positions to a folded position; in the folded position, the saw blade is outside the contained angle of 90° to 45° and said second end face of the saw blade is located in proximity to said working surface and facing toward said working surface , and wherein, the support arm is lockable in said working positions and in the folded position. <EOS>