The invention discloses a virtual experiment making method for a convex lens. The method is mainly comprises a video capturing flow, virtual-real fusion flow and an interactive display flow, and particularly comprises the following steps of: making a long wood board with a sliding guide rail, arranging three movable slide blocks on the long wood board, and placing three specified marks on the slide blocks respectively; and capturing the specified marks by using an ordinary camera, calculating the spatial locations and directions of the marks, mapping onto a virtual candle, a lens and an imaging board three-dimensional model respectively, synthesizing a virtual three-dimensional model which is generated in real time and a shot real scene to obtain a virtual-real fusion interactive scene, and displaying an object distance, an image distance and a focus distance in convex lens imaging in real time. The method is applied to middle school physical experiment teaching, and has the advantages of simple equipment, low cost, environmental friendliness and natural interactive behaviors; and a learner can adjust parameters at any time for observing the rule phenomenon of convex lens imaging,so that a good teaching effect is achieved.