Provided is a delay-fracture-resisting 1040 MPa-grade weather-proof bolt. The Delay-fracture-resisting 1040 MPa-grade weather-proof bolt is prepared from the chemical ingredients including, by mass percent, 0.21% to 0.32% of C, 0.10% to 0.50% of Si, 0.60% to 1.00% of Mn, 0.008% to 0.020% of P, not larger than 0.005% of S, 0.82% to 1.20% of Cr, 0.25% to 0.50% of Ni, 0.25 to 0.50% of Cu, 0.05% to 0.20% of Mo, 0.015% to 0.060% of Nb, 0.015% to 0.090% of V, 0.008% to 0.035% of Ti, 0.0008% to 0.0035% of B, 0.015% to 0.040% of Al, 0.003% to 0.007% of Ca, 0.015% to 0.045% of Zr, 0.010% to 0.045% of Re and the balance Fe and inevitable impurities. According to a method for preparing the bolt, the conventional high-purity smelting-continuous casting-rolling technology is mainly adopted, and metal raw materials are prepared into a steel material for the delay-fracture-resisting weather-proof bolt; and raw material acid pickling, steel pulling, blanking, end face chamfering, head cropping, head forming, head chamfering, shot blasting, semi-finished product surface treatment, hole shrinking, thread rolling, thermal treatment and finished product surface treatment are carried out according to aconventional method. The bolt is resistant to delay fractures and atmospheric corrosion and relatively low in cost.