Rock variable three-point bending creep testing method

The invention discloses a rock variable three-point bending creep testing method. The rock variable three-point bending creep testing method mainly comprises the following steps of placing a lower base of a rock three-point bending auxiliary tool at the center of a loading gasket of a loading disc at the bottom part of a rigid testing machine, and connecting the upper end of an upper base and a loading shaft of a loading disc at the top part of the rigid testing machine by a threaded opening; according to the requirements, fixing a left cutting tool and a right cutting tool to the specified positions of the lower base by tightening bolts, and butting an axial dial indicator with a computer test software system by a data transmission line; starting an axial oil pump to axially load to rocktransverse center points of a left tool blade of the left cutting tool and a right tool blade of the right cutting tool to be in contact with an upper tool blade of the upper cutting tool of the upperbase, and enabling the co