A hot rolled strip steel with yield strength higher than 600MPa for a mine rescue capsule and a preparation method of the hot rolled strip steel belongs to the technical field of metallurgy materials. The hot rolled strip steel comprises, by weight percent, 0.04-0.08% of C, 0.1-0.3% of Si, 1.5-1.7% of Mn, 0.01-0.05% of Al, 0.4-0.5% of Mo, 0.4-0.6% of Cr, 0.04-0.06% of Nb, 0.02-0.05% of Ti, 0.2-0.35 of Cu, not more than 0.01% of P, not more than 0.01% of S, and the balance Fe. A metallographic structure of the hot rolled strip steel is granular bainite with the yield strength no less than 600MPa, tensile strength no less than 800MPa, and elongation percentage after fracture no less than 18% at room temperature. The yield strength is no less than 450MPa, tensile strength is no less than 650MPa, and elongation percentage after fracture is no less than 19% at a high temperature of 500 DEG C. Impact energy at 20 DEG C is larger than 47J. Cold bending property is qualified. Atmospheric corrosion resistance index I under industrial environments is no less than 4.5. Sensitivity coefficient Pcm of welding cold crack is not more than 0.26%. The preparation method includes: smelting molten steel according to the preset components, casting ingots, heating, rough rolling, finish rolling to obtain the strip steel with thickness of 4-14mm, and fast cooling to obtain the finished hot rolled strip steel. The hot rolled strip steel has fine room-temperature and high-temperature mechanical performance and fine erosion resistance.