The invention provides inorganic binder precoated sand as well as a preparation method and application thereof. The inorganic binder precoated sand prepared by the invention is prepared by mixing modified inorganic reclaimed sand, sodium silicate and a catalyst. Wherein the specific preparation process of the modified inorganic reclaimed sand comprises the following steps: firstly, preparing inorganic reclaimed sand and a modified liquid semi-finished product by utilizing wet regeneration, then carrying out filter pressing treatment on the modified liquid semi-finished product, adjusting the conductivity by adding water or an inorganic binder to obtain a modified liquid finished product, and then adding the inorganic reclaimed sand into the modified liquid finished product for reaction to obtain the modified inorganic reclaimed sand. And drying to obtain the modified inorganic reclaimed sand. The prepared inorganic binder precoated sand is good in liquidity, high in strength, high in core making yield, capable of achieving circulation in the using process, simple in process, capable of being repeatedly used, low in cost and suitable for large-scale application and popularization.