The invention provides a corrosion resistant spraying polyurea. At first, isocyanate is modified by terminal hydroxyl fluorine containing silicone oil to obtain a modified isocyanate prepolymer with an improved performance on resistant acid-alkali corrosion; during the preparation process of the modified isocyanate prepolymer, if the activity of a catalyst is too strong, the reactions may be out of control, tri-polymerization reactions may be triggered, a self-made catalyst is adopted, a catalysis and catalysis inhibition method is adopted, salt forming is carried out at first, the reactions become controllable, and the reactions are promoted. The raw materials of a component A of polyurea namely polyester polyol and aliphatic isocyanate carry out reactions with aromatic isocyanate; the corrosion resistant performance of the isocyanate prepolymer is further enhanced; at the same time, the mechanical strength of polyurea is strengthened; the raw materials of the component A and a component B are properly matched to carry out reactions, the viscosity of obtained polyurea is proper, good spraying is realized, the surface drying time is short, and the acid/alkali resistant performanceis very good.