The invention relates to the field of metal solidification and continuous casting, in particular to a continuous casting vibrating support roller with a built-in eccentric rotating mechanism. The continuous casting vibrating support roller comprises a vibrating support roller body (1), outer rotating shafts (10), outer bearing seats (12), support seats (13) and base stands (18); the continuous casting vibrating support roller further comprises the eccentric rotating mechanism arranged in the vibrating support roller body (1); the eccentric rotating mechanism includes an inner rotating shaft (7), and at least one rotor driving part and at least one eccentric block (6) which are arranged on the inner rotating shaft (7); and the at least one rotor driving part is driven by a fluid power source to rotate to drive the inner rotating shaft (7) to rapidly rotate at a speed higher than the rotating speed of the vibrating support roller body (1), and the at least one eccentric block (6) is driven to rotate and generate controllable vibration, so that vibration perpendicular to a blank shell of a casting blank (19) is generated by the vibrating support roller body (1), and the blank shell ofthe casting blank (19) is subjected to a force and vibrates.