Off-axis aspheric surfaces are widely used in modern optical systems and generally require specific auxiliary optical elements to be detected. Accordingly, this study proposes a reverse iterative non-zero detection method that can be used to detect the same type of off-axis aspheric surfaces without auxiliary optical elements. First, we design a detection optical path and established a reverse iteration method to eliminate non-zero errors. Next, we analyz and compensated the system, adjustment, and random errors, as well as their processing methods. Finally, through a simulation, we obtain the RMS value of the surface shape of the off-axis aspheric surface using reverse iteration as 0.133λ, which is consistent with the actual surface shape of the simulation. The residual error of the simulation fitting is within 10 -5λ. In conclusion, the reverse iterative non-zero detection method is a high-precision and universal non-zero detection method for off-axis aspheric surfaces.