The invention relates to a method for improving the storage efficiency of a moonlet moonlet-borne solid-state memory. A new method is provided for solving the problem that a solid-state memory is low in storage efficiency. When the solid-state memory records data, frame synchronization is extracted to judge current AOS frame virtual channel identification, and if the current AOS frame virtual channel identification is a data filling frame, the current AOS frame virtual channel identification is not stored in the memory; if the current AOS frame virtual channel identification is an effective data frame, fixed data parts, such as a frame synchronization head, a version number, a spacecraft identifier, virtual channel identifier and channel coding check code parts not subjected to coding, in each frame are removed, and when data is read, AOS frame data is completely recovered according to label data made for an AOS frame. According to the method, only effective data in the AOS frame is recorded, and the storage efficiency of the solid-state memory is greatly improved.