The invention relates to wearable composite powder for sealing, a coating and preparation methods. The wearable composite powder for sealing comprises metal elements and a wearable component, wherein the metal elements comprise nickel and copper; and the wearable component is hexagonal boron nitride or graphite or a composition of the hexagonal boron nitride and the graphite. The first preparation method of the powder comprises the following steps of: coating nickel on the surface of the wearable component to form nuclear-shell-type composite powder; atomizing, drying and granulating the nuclear-shell-type composite powder and copper powder; sintering the granulated powder; and crushing the sintered powder and screening according to the requirement of product granularity. The second preparation method comprises the following steps of: sintering nickel powder and copper powder; then mixing the sintered nickel powder and copper powder with the wearable component; adding sodium silicate for agglomerating and granulating; and after screening wet materials, drying. The wearable composite powder for sealing and the coating prepared from the wearable composite powder disclosed by the invention can meet the requirement of temperature section wearable seal in an aeroengine, thereby improving the performance of the engine.