Disclosed is a wobble-plate variable stroke internal combustion engine, which comprises annular arranged cylinders (2) around a main shaft (21), pistons (8) in the cylinders, and a wobble plate (12) mounted on the inclined journal (34) of the main shaft. Because a range push rod (40) in the main shaft can be controlled to push the inclined journal (34) on the main shaft and the wobble plate (12) integrated thereof through a transverse shaft (35) to change the incline angle, thereby the pistons (8) in the cylinders can be correspondingly driven to change stroke, the cylinder can at proper displacement according to different engine power, and the unnecessary piston stroke and pumping loss can be reduced. Because the piston stroke can change, the displacement of the cylinder can be reduced from 100% to 30%. The variable stroke internal combustion engine of the invention is especially suitable for automobile power device using gasoline as fuel, and solves the problem that the common gasoline engine has large fuel consumption when the automobile runs in low speed because of city road condition.