The invention belongs to the field of functional materials and specifically discloses a high-glossiness coating, a high-glossiness paper and a preparation method thereof. The high-glossiness coating contains kaolin, titanium dioxide, polysiloxane, adhesive, nano-crystalline cellulose, polyvinyl alcohol, a defined amount of de-foaming agent and other auxiliaries. The preparation method for the high-glossiness paper comprises the following steps: gluing the surface of a paper sheet and then coating a pre-coating material and the high-glossiness coating, in the manner of using the pre-coating material composed of components, such as kaolin, for pre-coating, and then adopting the high-glossiness coating compounded on the basis of the formula for performing knife coating, thereby acquiring thehigh-glossiness paper with high glossiness. According to the invention, the raw paper is pre-coated with the pre-coating material containing kaolin, and then the knife coating of the high-glossiness coating is performed, so that the coating volume of the high-glossiness coating (titanium dioxide) is greatly reduced. The high-glossiness coating is coated after the raw paper is glued in advance, sothat the glossiness of the high-glossiness paper can be effectively promoted.