The invention discloses an inner-blended concrete pore structure regulator and a preparation method thereof. The inner-blended concrete pore structure regulator comprises: gas-phase process white carbon black, a structure control agent, natural quartz powder, a stearate, fatty amine polyoxyethylene ether, and fatty acid polyoxyethylene ester. The inner-blended concrete pore structure regulator c can reduce the quantity of low-harm holes and harmless holes in concrete, improve pore size and grading, improve self-compactness of concrete, reduce and retard migration of harmful matters to the pores of the concrete, and thus improve durability of the concrete and prolong the service life of a structure.