The invention provides a changeable tool bit with helical edges. The changeable tool bit with the helical edges comprises a tool bit main body, wherein a tool bit mounting hole and tool slots are formed in the tool bit main body; a plurality of blades are formed in the tool slots at intervals and are fixedly arranged in the tool slots through pressing blocks; the helical angle of a cutting edge of each blade is 35-43 degrees; and front surfaces and rear surfaces of the blades are positioned in a helical surface corresponding to a helical line of the tool slots. The changeable tool bit with the helical edges is characterized in that the helical angle between each tool slot and the corresponding cutting edge is suitable, during machining of the changeable tool bit, gentle transition and stable cutting are implemented, the cutting effect is good, the front surfaces and the rear surfaces are positioned in the helical surface corresponding to the helical line of the tool slots, during cutting, the front surfaces and the rear surfaces are tightly attached to a machined surface, the machined surface is smooth and flat after being cut, and the cutting noises are small.