The present disclosure provides a filter mounting structure, which includes a lens connecting pad and a first filter frame. The lens connecting pad is provided with a rotation adjusting ring and a mounting ring. The mounting ring and the rotation adjusting ring form a fastening connection therebetween. The mounting ring is provided with a limiting groove. The first filter frame is provided with a limiting block. The first filter frame is attracted on the mounting ring. The limiting block is received in the limiting groove. The rotation adjusting ring rotates to drive the mounting ring to rotate, and the mounting ring rotates to drive the first filter frame to rotate. The filter mounting structure further includes a second filter frame movably attracted to an end of the first filter frame away from the mounting ring, the second filter frame is rotatable relative to the first filter frame.