The present invention belongs to the technical field of power transformer internal partial discharge simulation and particularly relates to a transformer internal bubble electric discharge model. The bubble electric discharge model is formed by a high voltage electrode, a ground electrode, an oil pumping tube, an air injection tube, an oil pump and an air pump. A discharge part is immersed in transformer oil. The middle part of the oil pumping tube is in the shape of an upper convex arc, and an upper convex part is between the high voltage electrode and the ground electrode. A part of the air injection tube is inserted into the oil pumping tube which is connected to the oil pump, the transformer oil can be pumped into the oil pumping tube, and the bubble in the oil pumping tube also can be pumped. The injection tube is connected to the air pump, the bubbles can be injected into the oil pumping tube, thus the bubbles float upward and gather at the upper convex part of the oil pumping tube, thus the strong electric field area between the high voltage electrode and the ground electrode has the bubbles which are in the oil and can freely expand and retract, and thus a condition which is more close to the bubble electric discharge in the transformer oil of an actual condition is generated.