The invention discloses an experimental apparatus for verifying and observing wedge effect mechanism of hydrodynamic lubrication; the experimental apparatus is applicable to the teaching of Machine Design course in the major of machinery. The experimental apparatus comprises an observation platform, a fuel tank body, an oblique plate, side sealing devices, an oil circuit connection flange, a rubber pulley transmission device, and an oblique plate inclination adjusting device. The experimental apparatus provides necessary conditions for hydrodynamic lubrication (i.e., forming hydrodynamic oil film) through simulation, it is possible to visually demonstrate, observe and measure the wedge effect mechanism in hydrodynamic lubrication, to verify a basic equation in hydrodynamic lubrication: one-dimensional Reynolds equation, and to understand the relation between changes in oil film pressure and changes in lubricant viscosity, surface sliding speed and oil film thickness.