Provided is a bi-directional inverted grinding method for a full molded surface of a blade with two ends having tip shrouds. The bi-directional inverted grinding method comprises three steps: step 1, selecting a five-axis linkage machine tool having A/B axes, installing a cradle-like fixture having one end connected to an A axis and driven to rotate by the A axis and having the other end supported by a center hole for ensuring rotation between the cradle-like fixture and the A axis; step 2, selecting a dished circular-ring-surface grinding wheel for machining the blade surface of a blade installing end, a blade root transition surface and a tenon so that an included angel formed between the connecting line from the installing end of the blade to a cantilever end and the positive direction of a machine tool Z axis is an obtuse angle; step 3, enabling the cradle-like fixture to drive the blade to rotate for 180 degrees after the blade body part close to the installing end is finished machining such that the cantilever end of the blade faces upwards and the included angel formed between the blade body direction and the positive direction of the machine tool Z axis is an acute angle, and in the meantime, grinding a blade pot of the blade, a blade back and leading and exhaust edge portions of the blade. In the step 1, some portions of the cradle-like fixture deviate from of the center of the A axis and the center of the blade body draws close to the rotary center of the A axis as much as possible.