A camera optical lens includes, from an object side to an image side: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens, a fourth lens, a fifth lens having a positive refractive power and a sixth lens having a negative refractive power. The camera optical lens satisfies following conditions: 0.25≤d10/TTL≤0.50 and 0.55≤f1/f≤1.00, here f denotes a focal length of the camera optical lens, f1 denotes a focal length of the first lens, d10 denotes an on-axis thickness from an image-side surface of the fifth lens to an object-side surface of the sixth lens, and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis. The camera optical lens has excellent optical performances such as a large aperture, a wide angle and ultra-thin etc..