The utility model provides a shield cutterhead centre of turning circle axle soil sand seal structure, includes blade disc centre of turning circle axle and native storehouse baffle, is being equipped with seal support with blade disc centre of turning circle axle corresponding position on the baffle of native storehouse, and seal support is last to be installed sealedly, sealed to one at least lip seal and twice combination lip seal at least, and the epaxial detachably of blade disc centre of turning circle is fixed with the sleeve, sealedly hugs closely with telescopic surface. The utility model has the characteristics of sealing performance is good, and the wearing and tearing of centre of turning circle axle are little, restores portably, with low costs.