The invention discloses a high pressure micro clearance lubrication testing machine, which is applicable to a lubrication testing system which is used to realize the measurement of the depth of a lubricating membrane, friction force and temperature in a micro clearance under the working conditions of high pressure and high shearing rate. The high pressure micro clearance lubrication testing machine comprises a support bench, a lifting bench fixed on the supporting bench, a mechanical system arranged on the lifting bench and a loading system and a temperature system which are connected with the mechanical system respectively. The mechanical system is provided with a ceramic ball, a membrane depth measurement system and a friction force measurement system and comprises a oil tank system and a spindle system. The loading capacity and rheological property of materials under the conditions of high pressure micro clearance lubrication can be assessed by controlling the maximum contact force, interface clearance and shearing rate between the ceramic ball and a ceramic sleeve on the spindle so as to provide experiment data for creating lubrication model in a high pressure micro clearance and provide solutions to optimize the selection of lubricating and abrasion-resisting materials in tough conditions.