The invention discloses a surface contact type wheelset bearing grease uniformization test device and a test method thereof. The test device comprises a beam 1, two uprights 2, a base 3, a pair of driving shafts mutually bilaterally symmetrically arranged and a motor 8 connected with the driving shafts; the beam 1 comprises a beam box body 4, and two press-down devices are bilaterally symmetrically arranged inside the beam box body 4; each upright 2 comprises an upright box body 7; each driving shaft comprises a spindle 9 and a bearing connector 10; each driving shaft is arranged at the middlepart of the corresponding upright box body 7; an output shaft of the motor is connected with the spindles 9; the output ends of the spindles 9 are connected with the corresponding bearing connectors10; and the bearing connectors 10 are conjugated with an outer ring of a wheelset bearing in a surface contact mode. The invention further provides a test method of the device, which comprises six steps of preparation before an experiment, workpiece loading, test starting, a grease uniformization test, test ending and workpiece unloading. The test method adopts a mode of driving the outer ring ofthe bearing to rotate to uniformize grease, can carry out loading, and is small in rotational inertia, low in power consumption and safe in test process.