The invention provides a verification system for a large-scale weighing machine and a self-location loading-unloading measuring device thereof. The verification system comprises at least four tension frameworks, at least four self-location loading-unloading measuring devices and a constant-load control device, wherein the four tension frameworks pass through a weighing platform hole preset on a weighing platform surface of the weighing machine to be connected with a weighing platform foundation and is perpendicular to the weighing platform surface; the four self-location loading-unloading measuring devices correspond to the tension frameworks, the self-location loading-unloading measuring devices comprise a self-location loading-unloading mechanism and a high-precision load measuring instrument which is tightly close to the upper end of the loading-unloading mechanism, and the high-precision load measuring instrument is at least 3 times as accurate as the weighing machine; and the constant-load control device is connected with the loading-unloading mechanism and enables the loading-unloading mechanism to maintain constant applied load while loading. The verification system of the invention has rational structure, and can greatly improve operating efficiency and safety and save cost.