Object mass center measuring device and method

The invention relates to a static balance testing method of a machine or a structural part, in particular to the determination of an object mass center. The invention provides an object mass center measuring method which is simple and convenient to operate. The object mass center measuring method comprises steps of: adjusting a circular disc to keep balance; adjusting a flap and insuring theta to be equal to 0; placing a tested object on the flap; reading indications of a first tension force sensor, a second tension force sensor and a third tension force sensor; rotating the flap about an angle of theta along an OY direction toward a hinge joint position; reading the indications of the first tension force sensor, the second tension force sensor and the third tension force sensor; and for the measurement result supposing distances of a centroid of the tested object and a coordinate original point of the tested object in X, Y and Z directions to be X0, Y0 and Z0.