Wide-field and high-quality space camera is the future development direction of payload. Based on the alignment requirements of the wide-field space camera, an image plane measurement method combining interferometry and geometric measurement was proposed. The image plane measurement platform of the wide-field space camera was built. A laser interferometer was used to determine the focal position of each field of view and a laser tracker was used to obtain the coordinates of each focal position in this method. Finally, the image plane was drawn through coordinate conversion and fitting. Image plane measurement error could be controlled within 0.01 mm. Through this method, the image plane drawing of off-axis three-mirror reflective space camera was completed, the system was with a focal length of 1200 mm, a F-number of 2.4, a linear field of view of 10°×1°. The test image plane was compared with the ideal image plane output by the optical design software ZEMAX, the shape and position of the image plane were basically consistent, and the flatness deviation was at 0.009 mm. The test results show that the optical system is aligned in place, and it provides an important basis for the completion of the detector registration process.