A camera module, comprising a holder, a lens, an image sensor assembly, and one or more self-locking screws (400, 500); wherein the holder comprises a first surface and a second surface, the first surface and the second surface are opposite; the holder further comprises an inner side wall, the inner side wall defines a lens mounting hole, the lens mounting hole penetrates through the first surface and the second surface, the lens mounting hole is configured for mounting the lens; the holder defines one or more screw holes (202, 206) for mounting the one or more self-locking screws (400, 500); the holder further comprises a supporting platform, a location guiding sleeve and internal threads, the supporting platform, the location guiding sleeve and the internal threads are formed on the inner side wall and arranged along a direction from the first surface to the second surface, the supporting platform is formed by recessing from the first surface toward the second surface; wherein the lens comprises an outer side wall, external threads, a location guiding step and a limit ring, the external threads, the location guiding step and the limit ring are disposed on the outer side wall, the external threads cooperate with the internal threads, the location guiding step is mounted in the location guiding sleeve, the limit ring is mounted on the supporting platform; wherein the image sensor assembly is attached on the second surface; wherein the one or more self-locking screws (400, 500) are configured for fixing the lens to the holder and fixing the holder and the image sensor assembly; wherein the one or more self-locking screws (400, 500) comprise one or more first self-locking screws and one or more second self-locking screws, the one or more first self-locking screws are configured to fix the lens and the holder, and the one or more second self-locking screws are configured to fix the holder and the image sensor assembly; characterized in that, the limit ring comprises a third surface and a fourth surface, the third surface abuts against the supporting platform, the fourth surface is opposite to the third surface; the one or more first self-locking screws comprises at least two first self-locking screws, the at least two first self-locking screws surround the lens mounting hole, the first self-locking screws are cooperated and fixed with corresponding screw holes (202, 206) of the holder, and the first self-locking screws are pressed against the fourth surface. wherein the holder comprises a first surface and a second surface, the first surface and the second surface are opposite; the holder further comprises an inner side wall, the inner side wall defines a lens mounting hole, the lens mounting hole penetrates through the first surface and the second surface, the lens mounting hole is configured for mounting the lens; the holder defines one or more screw holes (202, 206) for mounting the one or more self-locking screws (400, 500); the holder further comprises a supporting platform, a location guiding sleeve and internal threads, the supporting platform, the location guiding sleeve and the internal threads are formed on the inner side wall and arranged along a direction from the first surface to the second surface, the supporting platform is formed by recessing from the first surface toward the second surface; wherein the lens comprises an outer side wall, external threads, a location guiding step and a limit ring, the external threads, the location guiding step and the limit ring are disposed on the outer side wall, the external threads cooperate with the internal threads, the location guiding step is mounted in the location guiding sleeve, the limit ring is mounted on the supporting platform; wherein the image sensor assembly is attached on the second surface; wherein the one or more self-locking screws (400, 500) are configured for fixing the lens to the holder and fixing the holder and the image sensor assembly; wherein the one or more self-locking screws (400, 500) comprise one or more first self-locking screws and one or more second self-locking screws, the one or more first self-locking screws are configured to fix the lens and the holder, and the one or more second self-locking screws are configured to fix the holder and the image sensor assembly; characterized in that, the limit ring comprises a third surface and a fourth surface, the third surface abuts against the supporting platform, the fourth surface is opposite to the third surface; the one or more first self-locking screws comprises at least two first self-locking screws, the at least two first self-locking screws surround the lens mounting hole, the first self-locking screws are cooperated and fixed with corresponding screw holes (202, 206) of the holder, and the first self-locking screws are pressed against the fourth surface.