An assembling process of a multi-lens camera module (100, 200), the assembling process comprising steps of: (a) providing a casing, a first circuit board, a first photosensitive element, a first lens module, a second circuit board, a second photosensitive element and a second lens module, wherein the first lens module comprises a first lens element and a first lens holder, the first lens element is supported by the first lens holder, the second lens module comprises a second lens element and a second lens holder, and the second lens element is supported by the second lens holder; (b) installing the first photosensitive element and the first lens module on the first circuit board, and fixing the first circuit board on the casing; (c) installing the second photosensitive element and the second lens module on the second circuit board, and coating a bottom glue on a lower connection part of the second lens holder; (d) penetrating the second lens module through a receiving opening of the casing, and adhering the lower connection part of the second lens holder onto the casing through the bottom glue; (e) performing an optical axis parallel adjustment process, so that a second optical axis of the second lens element is adjusted to be in parallel with a first optical axis of the first lens element; (f) coating a top glue on an upper connection part of the second lens holder, so that the upper connection part of the second lens holder is adhered onto the casing through the top glue; (g) pre-curing the top glue, so that the second lens module is adhered onto the casing through a pre-cured bonding strength of the top glue, wherein the second optical axis is in parallel with the first optical axis; and (h) baking the multi-lens camera module (100, 200), so that the top glue and the bottom glue are completely cured. (a) providing a casing, a first circuit board, a first photosensitive element, a first lens module, a second circuit board, a second photosensitive element and a second lens module, wherein the first lens module comprises a first lens element and a first lens holder, the first lens element is supported by the first lens holder, the second lens module comprises a second lens element and a second lens holder, and the second lens element is supported by the second lens holder; (b) installing the first photosensitive element and the first lens module on the first circuit board, and fixing the first circuit board on the casing; (c) installing the second photosensitive element and the second lens module on the second circuit board, and coating a bottom glue on a lower connection part of the second lens holder; (d) penetrating the second lens module through a receiving opening of the casing, and adhering the lower connection part of the second lens holder onto the casing through the bottom glue; (e) performing an optical axis parallel adjustment process, so that a second optical axis of the second lens element is adjusted to be in parallel with a first optical axis of the first lens element; (f) coating a top glue on an upper connection part of the second lens holder, so that the upper connection part of the second lens holder is adhered onto the casing through the top glue; (g) pre-curing the top glue, so that the second lens module is adhered onto the casing through a pre-cured bonding strength of the top glue, wherein the second optical axis is in parallel with the first optical axis; and (h) baking the multi-lens camera module (100, 200), so that the top glue and the bottom glue are completely cured.