The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens having a positive refractive power; a third lens having a negative refractive power; a fourth lens; a fifth lens; and a sixth lens. The camera optical lens satisfies following conditions: −10.00≤f1/f3≤−1.00; 3.00≤R5/R6≤20.00; and 100≤(R3+R4)/(R3−R4). The camera optical lens can achieve a high imaging performance while obtaining a low TTL.