The present application relates to the field of optical lenses. Disclosed is a camera optical lens, which consists of a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power and a
triangular prism having a negative refractive power, which are arranged in sequence from the object side to the image side. An on-
axis distance from the object-side surface of the first lens to the image-side surface of the third lens is D, a total optical length of the camera optical lens is TTL, a
focal length of the camera optical lens is f, a
refractive index of a glass lens of the camera optical lens is ndi, the sagittal height of the image-side surface of the third lens at the maximum effective optical
diameter is SAG32, half of the maximum effective optical
diameter of the image-side surface of the third lens is SD32, a
focal length of the third lens is f3, an on-axis thickness of the third lens is d5, a
radius of curvature of the object-side surface of the third lens is R5, and a
radius of curvature of the image-side surface of the third lens is R6, which satisfy the following relational expressions: 0.11≤D / TTL≤0.20, 0.10≤D / f≤0.22, 1.49≤ndi≤1.85, 0.32≤|SAG32| / SD32≤0.52 and -20.03≤f3*d5 / (R5-R6)≤-7.99.