The invention relates to a hot rolling strip steel having the yield strength being higher than 800MPa and a preparation method thereof, belonging to the field of metallurgical technology. The hot rolling strip steel comprises the components according to the weight percentage: 0.08-0.14% of C, 0.01-0.20% of Si, 1.70-2.20% of Mn, 0.04-0.07% of Nb, 0.00-0.07% of V, 0.08-0.18% of Ti, less than 0.01% of P, less than 0.01% of S and the rest of Fe. The yield strength of the hot rolling strip steel is more than or equal to 800MPa. The preparation method comprises molten steel is smelted according to the set components and then casted into casting blank; after being heated, the casting blank is processed by rough rolling to obtain intermediate blank; then, after precision rolling is carried out, the thickness of the strip steel is 2-14mm; finally, the finished product hot rolling strip steel is obtained after being cooled and wound. The hot rolling strip steel has good low-temperature flexibility and low production cost.