Using mechanical hydraulic shears instead of traditional flame cutting can effectively solve the problem of waste gas generated during cutting of billet and reduce resource waste. Based on the performance and shearing quality of existing mechanical and hydraulic shears, theoretical simulation + actual production verification method is used to obtain the effects of billet material, temperature, billet thickness, tool and shearing speed on the shearing process and billet shearing section. Using the controlled variable method, the factors that have the greatest influence on the cross-section shape of the billet are screened out, and the optimal conditions for cross-section formation during shearing of multiple types of steel are obtained. Hydraulic shearing of continuous cast billet can effectively seal high-temperature molten steel. It can be quickly sheared at high temperatures of 970-1050 ° C without leaking steel. It can work normally at a drawing speed of 2-4 meters/minute. The shearing process only takes 8-10 seconds, which is far faster than flame cutting (about 40 seconds). According to the annual output of a steel company of 20 million tons, and the coal consumption per ton of steel is calculated as 50kg. The hydraulic shear of steel billet does not need to consume coal resources, and can save 1 million tons of coal every year. The calculation of each ton of coal is calculated at 0.5 million yuan., it can save 500 million yuan; according to the calculation standard of carbon emissions, if the carbon dioxide emitted by consuming 1 ton of standard coal is 2.6 tons, carbon emissions can be reduced by 2.6 million tons per year.