The invention discloses a photographing type oil drop experiment method. The method comprises steps of adjusting a photographing type oil drop experiment instrument and setting an exposure time T of photographing equipment; spraying oil to generate oil drops; taking a trajectory diagram of a series of oil drops moving downward uniformly when the electric field is not applied; applying a certain DCvoltage U to an upper plate 1 and a lower plate 2; taking a trajectory diagram of the same series of oil drops moving upward uniformly under the action of an electric field; and selecting moving trajectories of a plurality of proper oil drops according to the trajectory diagrams and comparing them with a scale, measuring the falling distances of n oil drops, finding out rising trajectories of then oil drops corresponding to falling trajectories in the rising trajectory diagram, measuring their rising distances, and calculating the amount of charges of the n oil drops. The method has the advantages of high measurement accuracy, high efficiency and no waste of oil.