A camera platform locking device, including a housing, for preventing the components from exiting; in the housing from the top down are configured: a sphere, for providing a support to the camera; a locking mechanism, arranged underneath the sphere, for working with the housing to lock the sphere inside the housing; a platform base, arranged underneath the locking mechanism, and fixedly connected to the housing, for providing a support to the locking mechanism. A camera platform locking device of this invention may allow two regulating assemblies to gain distinguished moving distances for achieving different regulation purposes when rotating each knob of the regulating assemblies with the same angle so as to improve the regulation performance of the locking device.