The invention discloses a method for measuring three-dimensional displacement by high-speed photography, comprises the following steps of measuring the vertical displacement of one end of a rod usinga wire displacement sensor, and capturing a mark at the other end of the rod using a high speed camera; listing a coupled equation between the physical quantities measured by the two devices by usingthe coupling relationship between the linear displacement sensor and the high-speed photography in measuring the rod; squaring and adding the two sides of the equation multiple times in the solution,eliminating a azimuth angle and a zenith angle in the three-dimensional motion of the rod, and transforming the coupling equation into a quadratic equation with only the unknown lambda (t); finally, transforming the three-dimensional displacement in the high-speed camera coordinates into a three-dimensional displacement in the world coordinate system by using the relationship between a world coordinate system and the high-speed camera coordinate system, and realizing the three-dimensional displacement measurement of the free end of the rod. The invention has the advantages that the data processing is simplified, the equipment installation is simple, the equipment is not affected by the impact during the measurement process, and the safety of the equipment is protected.