The purpose of this paper is to ensure that the long-term storage technology of large marine gearbox can ensure the good technical condition of the gearbox after ten years of storage, except for the life parts. By analyzing the shortage of traditional storage technology and the characteristics of long-term storage of the whole machine, and learning from the new sealed anti-rust technology and monitoring technology, the paper adopts the method of classification treatment, divides different systems, adopts flexible moisture-proof material with high ES in camouflage to form a closed space, uses oil-soluble gas anti-rust oil and uses different materials to monitor the samples from time to time, so that the gear box is in good condition for long-lasting storage. According to the monitoring of parts, machine and sub-package, the gearbox is in good technical condition after long-term storage, and the gearbox or parts can be used as spare parts at any time. The long-term storage technology of large marine gearbox can ensure the good technical condition of the gearbox after maintenance.