The invention discloses an anti-erosion ladle long nozzle preparation method which comprises step 1 of mixing materials to prepare a glazing composition; step 2 of compressing and forming a ladle long nozzle, wherein the ladle long nozzle comprises a main body and an inner hole formed in the main body, the inner hole comprises a lateral wall; a first work area is arranged on the outer side of the main body, and the lateral wall is provided with a second work area; step 3 of spraying the glazing composition prepared in the step 1 on the first work area in the step 2 and prepfroming high-temperature oxidizing and heating to finish sintering, wherein the first work area can generate a first anti-oxidation layer under a high-temperature oxidizing state, and carbon in the lateral wall can generate oxidization reaction to generate a second anti-oxidation layer with a high porosity under the high-temperature oxidizing state. According to the anti-erosion ladle long nozzle preparation method disclosed by the invention, an anti-oxidation layer on the inner side is prevented from being arranged independently, furthermore a reducing atmosphere is prevented from being set, and the anti-oxidation layers on the inner side and the outer side and a body of the ladle long nozzle are synchronously sintered directly through an oxidizing environment; thus, the technical problem of complex technologies is solved.