The invention relates to a Wolter‑I type X-ray optical reflective lens performance evaluation method, which belongs to the field of space optics technology; Step 1, select the optical reflective lens; Step 2, divide the slope error measurement grid and roundness on the outer wall of the optical reflective lens Error measurement grid; step 3, measure the slope error h k,i , roundness error and actual radius r j ; Step 4, calculate the conversion slope error data h' k,i ; And reconstruct the fitting mirror surface according to the conversion slope error data; Step 5, set up an incident ray from the parabolic primary mirror into the optical reflector; Step 6, determine the normal vector of the first reflection point a, a point and the first reflection Step 7, determine the second reflection point b, the normal vector and the exit direction after the second reflection; Step 8, judge the performance of the optical mirror according to the distribution range of all focus points; the present invention will accuracy High, small amount of calculation, high efficiency.