The invention relates to a mechanical micro-displacement output platform. A deceleration device is formed by a driving hand wheel and a first-level deceleration mechanism. A displacement adjustment device is divided into two working modes that a left-side displacement adjustment device includes a gear and a worm gear transmission mechanism; and a right-side displacement adjustment device includesgears, a screw sliding block, a gear rack transmission mechanism and an up-down flexible compression member scaling mechanism. Each of left-side and right-side output devices includes two L-shaped plates, an angular displacement adjustment mechanism, a displacement lifting mechanism and an oil slot. Verification parts of two sides include ultrasonic probes, ultrasonic pulse transmitting/receivinginstruments, oscilloscopes and PC machines. The mechanical micro-displacement output platform of the invention overcomes the problems of small output strokes, hysteresis, creeping and the like of piezoelectric ceramic micro-displacement mechanisms, has the advantages that high-precision displacement can be output, relatively-low-precision large-stroke displacement can also be output, hysteresis does not exist, and creeping does not exist, and is applied to precision detection of continuously measuring different lubricating film thickness by the ultrasonic probes.