A stator lamination with unequal slots for use in three-phase asynchronous motor having low harmonic and unequal turns winding, including a ring-shaped substrate, wherein at least six stator slot groups for placing copper wire are radially and uniformly arranged on the inner ring surface of the substrate along the circumference direction of the substrate, the number of stator slots per pole and phase in each stator slot group is three to nine, including at least one large stator slot and at least two small stator slots, the area of the small stator slot is 80% - 95% of that of the large stator slot and the center angles between the adjacent stator slots are equal; the arrangement of the large stator slot and the small stator slot in each stator slot group is as follows: the at least one large stator slot is arranged in the middle of the stator slot group, and the two sides of the large stator slot are respectively symmetrically arranged with one or more small stator slots; the large stator slot and the small stator slot are semi closed pear shaped slots composed of a rectangular slot, characterized in that a first isosceles trapezoidal slot, a second isosceles trapezoidal slot and a semicircle slot, wherein, one end of the large stator slot and the small stator slot close to the inner ring surface of the substrate is set as the rectangular slot, the width of the rectangular slot is 2.5-4.2mm, the height of the rectangular slot is 0.9-2.0mm, the second isosceles trapezoidal slot is arranged at the end of the first isosceles trapezoidal slot far from the center of the substrate, the upper base of the first isosceles trapezoidal slot is collinear with the long side of the rectangular slot, the lower base of the first isosceles trapezoidal slot is collinear with the upper base of the second isosceles trapezoidal slot, the width of the lower base of the first isosceles trapezoidal slot is 5-10mm, the angle between the hypotenuse and the lower base of the first isosceles trapezoidal slot is 20°-30°, the width of the lower base of the second isosceles trapezoidal slot is 8-15mm, and the height of the second isosceles trapezoidal slot is 12-40mm, the semicircle slot is arranged at the lower base of the second isosceles trapezoidal slot, and the diameter of the semicircle slot is equal to the width of the lower base of the second isosceles trapezoidal slot. at least six stator slot groups for placing copper wire are radially and uniformly arranged on the inner ring surface of the substrate along the circumference direction of the substrate, the number of stator slots per pole and phase in each stator slot group is three to nine, including at least one large stator slot and at least two small stator slots, the area of the small stator slot is 80% - 95% of that of the large stator slot and the center angles between the adjacent stator slots are equal; the arrangement of the large stator slot and the small stator slot in each stator slot group is as follows: the at least one large stator slot is arranged in the middle of the stator slot group, and the two sides of the large stator slot are respectively symmetrically arranged with one or more small stator slots; the large stator slot and the small stator slot are semi closed pear shaped slots composed of a rectangular slot, characterized in that a first isosceles trapezoidal slot, a second isosceles trapezoidal slot and a semicircle slot, wherein, one end of the large stator slot and the small stator slot close to the inner ring surface of the substrate is set as the rectangular slot, the width of the rectangular slot is 2.5-4.2mm, the height of the rectangular slot is 0.9-2.0mm, the second isosceles trapezoidal slot is arranged at the end of the first isosceles trapezoidal slot far from the center of the substrate, the upper base of the first isosceles trapezoidal slot is collinear with the long side of the rectangular slot, the lower base of the first isosceles trapezoidal slot is collinear with the upper base of the second isosceles trapezoidal slot, the width of the lower base of the first isosceles trapezoidal slot is 5-10mm, the angle between the hypotenuse and the lower base of the first isosceles trapezoidal slot is 20°-30°, the width of the lower base of the second isosceles trapezoidal slot is 8-15mm, and the height of the second isosceles trapezoidal slot is 12-40mm, the semicircle slot is arranged at the lower base of the second isosceles trapezoidal slot, and the diameter of the semicircle slot is equal to the width of the lower base of the second isosceles trapezoidal slot.