The invention discloses a method for incinerating 
petrochemical industry waste 
liquid based on 
mixed fuel of gas and oily liquid. The method comprises the steps of spraying the 
petrochemical industrywaste liquid into a 
combustion area of a 
spent caustic incinerator in an atomized manner, using 
fuel gas and oily liquid as 
combustion-supporting fuel, and carrying out 
combustion on the condition ofblowing in gas with 
oxygen while controlling the temperature of the combustion area to range from 800 DEG C to 1, 200 DEG C, wherein the material input of 
petrochemical industry waste liquid, and thematerial input of the 
fuel gas and the oily liquid simultaneously meet the requirements that the ratio of petrochemical industry waste liquid quantity per hour to 
spent caustic incinerator combustionarea 
hearth cross sectional area ranges from 0.7 to 1.0 t / h.m2, the ratio of 
fuel gas quantity per hour to 
spent caustic incinerator combustion area 
hearth cross sectional area ranges from 0.05 to 0.09 t / h.m2, and the ratio of oily liquid quantity per hour to spent caustic incinerator combustion area 
hearth cross sectional area ranges from 0.03 to 0.08 t / h.m2. With the method for incinerating petrochemical industry waste 
liquid based on 
mixed fuel of gas and oily liquid, it can be achieved that the combustion load is reasonable, the 
processing cost is reduced, damage caused by overhigh combustion load to a device is reduced, and it is beneficial for a waste liquid 
incineration technology to be promoted and applied to industries.