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In order to promote the international digitization of astronomical plates, Shanghai Observatory is developing a special high-precision digitizer for astronomical plates. The two-axis linear motion platform is the core component of the high-precision astronomical plates digitizer, and its parameters need to be tested to obtain its direct influence on the accuracy of digitization of astronomical plates. Based on the principle of laser interferometry, the optical path for measurement is built by using RENISHAW XL80 laser interferometer. The key performance of the air-bearing platform for the astronomical plate digitizer which is being developed by Shanghai Astronomical Observatory is tested. Results show that the positioning repeatability of the stage fixed on the air-bearing motion platform is better than 0.025μm, the straightness and flatness are both better than 0.3μm, and the attitude errors including pitch and yaw are less than 0.3″. The air-bearing motion platform can meet the development requirement for high-precision digitization equipment to digitize astronomical plates. The results can offer a reference for the overall performance evaluation of the digitizer and provide a basis subsequently for compensating systematic positioning error.