High-mileage and low-rolling-resistance all-steel radial tire

The invention provides a high-mileage and low-rolling-resistance all-steel radial tire. The high-mileage and low-rolling-resistance all-steel radial tire comprises a tread, the tread is provided withfour circumferential main grooves which extend in the circumferential direction of the tire and are sequentially divided into a first circumferential main groove, a second circumferential main groove,a third circumferential main groove and a fourth circumferential main groove in the tire width direction, two-section type grooves are adopted in the second circumferential main groove and the thirdcircumferential main groove, the draft angle c1 on one sides of the upper sections of the two-section type grooves is unequal to the draft angle c2 on the other sides of the upper sections of the two-section type grooves, and the width a1 of the first circumferential main groove and the width a2 of the second circumferential main groove meet the relation that a1/a2 is greater than and equal to 1.5and less than and equal to