The invention provides a method for machining a steel strip for an anti-theft window. The method comprises the following steps that S1, the long-strip-shaped steel strip to be machined is pressed into a first predetermined shape through a first pressing wheel mechanism; S2, the steel strip in the first predetermined shape in the step S1 is pressed into a second predetermined shape through a second pressing wheel mechanism; S3, the steel strip in the second predetermined shape in the step S2 is pressed into a third predetermined shape through a third pressing wheel mechanism; S4, the steel strip in the third predetermined shape in the step S3 is pressed into a fourth predetermined shape in the step S3 through a fourth pressing wheel mechanism; S5, the steel strip in the fourth predetermined shape in the step S4 is pressed into a fifth predetermined shape through a fifth pressing wheel mechanism; and S6, the steel strip in the fifth predetermined shape in the step S5 is pressed into a sixth predetermined shape through a sixth pressing wheel mechanism. By means of the method, the production efficiency is improved, the ideal part size precision can be obtained, the strength of parts is made far higher than the strength of raw materials, the mechanical performance of the parts is improved, the straightness is high, the motor power is low, machine operation is smoother, and resistance is low.