The invention relates to a sawing machine with a good clamping effect. The sawing machine comprises a base, a fixed plate, a movable plate, a driving mechanism and a clamping mechanism; the driving mechanism comprises a motor, a lead screw and a walking ring; and the clamping mechanism comprises a connecting plate, an auxiliary plate, a sliding block, a first spring, a clamping assembly, a limiting assembly and an adjusting assembly. According to the sawing machine with the good clamping effect, movement of the movable plate is achieved through the driving mechanism, so that a main body is fixed, elastic clamping of the main body is achieved through the clamping mechanism, and compared with an existing clamping mechanism, the clamping mechanism pushes the sliding block to move through theauxiliary plate, so that inflation of an air bag and a piston cylinder is achieved; vertical and transverse elastic fixation of the main body is achieved, deformation of the main body due to too largeclamping force is prevented, meanwhile, the connecting plate and the auxiliary plate are moved through the adjusting assembly, the main body with different heights can be cut, and the use practicability is improved.