The invention belongs to the technical field of new energy materials, in particular to an all-solid-state lithium ion battery and an integrated composite sintering preparation process thereof. The all-solid-state lithium ion battery comprises at least one electrode-electrolyte composite electrode sheet. The electrode of the electrode-electrolyte composite electrode sheet is made of lithium oxide positive electrode or oxide negative electrode material, and the electrode is a solid oxide electrolyte. The interface problem of the all-solid-state lithium battery can be effectively improved and theinterface bonding degree and the interface structure stability between the electrode and the solid electrolyte can be remarkably enhanced so that the single cell has higher density and energy densityand also has very excellent safety performance and is suitable for large-scale production and application.