A wear compensator apparatus of a clutch actuator for compensating for worn-out thickness on a disc facing may include a main plate, a support plate installed on the main plate and linearly movable on the main plate, wherein the pull rod may be connected thereto, an moving piece installed on the support plate and linearly movable on the support plate, wherein the moving piece may be connected to the operation lever by a rotation shaft, a first space adjusting unit engaged with the pulling rod and moving the pull rod in a direction so that wear on the disc facing may be compensated for, and a second space adjusting unit engaged with the moving piece and moving the moving piece in the other direction so that an initial position of the rotation shaft may be maintained when the pull rod may be moved in the direction.