The invention relates to the technical field of measuring equipment, in particular to a miniature bearing measuring device, comprising a power mechanism, wherein the output shaft of the power mechanism is connected with the inner ring of a bearing to be tested, the outer ring of the bearing to be tested is connected with a loading ring, the loading ring is provide with a loading mechanism, a forcemeasuring mechanism is arranged on the side of the loading ring, the force measuring mechanism comprises a force applying rod connected to the side of the loading ring at the left end, and the rightend of the force applying rod is connected with a sensor. In the invention, the loading part has a self-aligning function to well ensure pure axial loading without generating an overturning moment with respect to the axis; the position of the sensor increases a homing device of the electromagnet, so that the force sensor can automatically zero, and the problem that it is impossible for self-zeroing or it is too difficult for manual zeroing caused by too sensitive sensor and small range of the sensor; the installation and replacement are convenient and fast, and the loading block can be disassembled and replaced without affecting the test of the test bearing.