The invention provides a bearing roller plastic deformation experiment device and a using method thereof. The device comprises a roller base and a bottom plate; a left side guide supporting mechanismand a right side guide supporting mechanism are fixed to the left side and the right side of the bottom plate; the left and right side guide mechanisms are guide rail-slider mechanisms; the sliders ofthe left and right side guide mechanisms are fixed to the left end and the right end of a lifting cross beam; the upper side of the lifting cross beam is connected to one end of a pressure sensor; the upper end of the pressure sensor is connected with a lifting drive mechanism; the lifting cross beam is in hinged joint with a pressure plate; the pressure plate is in rotatable connection with a contact plate; a positioning mechanism of the contact plate is arranged; the contact plate is cross-shaped; one side of the cross is provided with a protruding plate extending out downward; the protruding plate is in clearance fit with a calibration notch in the roller base; another side of the cross-shaped contact plate is used for loading and pressing a roller. With an electric push rod and the pressure sensor, automation of pressure adjustment and pressure loading processes is realized.