An under-screen optical fingerprint identification device, for a display screen of an electronic apparatus, wherein, the under-screen optical fingerprint identification device comprises: a reflecting component, a lens and a fingerprint sensor; the reflecting component, the lens and the fingerprint sensor are provided on a fingerprint detection light path of the under-screen optical fingerprint identification device; the lens is provided on a reflection path of the reflecting component, and is configured to converge fingerprint light reflected by the reflecting component to the fingerprint sensor; wherein the reflecting component comprises a mirror body, and the mirror body comprises a planar surface; wherein, an incident angle of the fingerprint light on the planar surface is greater than or equal to a preset angle, the fingerprint light being reflected by a finger to the display screen and entering the fingerprint sensor through the fingerprint detection light path; wherein, at least one surface of surfaces of the mirror body other than the planar surface forms a mirror; the reflecting component further comprises a mounting portion provided on the mirror body, and the lens is fixed onto the mirror body through the mounting portion; wherein, the mirror body comprises two inclined planes that are parallel to each other and have a certain tilt angle with respect to the planar surface: one inclined plane is adjacent to a bottom surface of the mirror body and forms a first mirror, and the other inclined plane is adjacent to a top surface of the mirror body and forms a second mirror, wherein the bottom surface is parallel to the planar surface and the top surface is the planar surface, wherein, the second mirror is located on a reflection path of the first mirror; wherein, the mirror body is formed with a notch on a reflection path of the second mirror; the notch has a mounting plane parallel to the planar surface; and the mounting plane serves as the mounting portion for mounting the lens; wherein, the fingerprint sensor is accommodated inside the notch and is provided facing the lens; and a photosensitive surface of the fingerprint sensor is parallel to the mounting plane. the reflecting component, the lens and the fingerprint sensor are provided on a fingerprint detection light path of the under-screen optical fingerprint identification device; the lens is provided on a reflection path of the reflecting component, and is configured to converge fingerprint light reflected by the reflecting component to the fingerprint sensor; wherein the reflecting component comprises a mirror body, and the mirror body comprises a planar surface; wherein, an incident angle of the fingerprint light on the planar surface is greater than or equal to a preset angle, the fingerprint light being reflected by a finger to the display screen and entering the fingerprint sensor through the fingerprint detection light path; wherein, at least one surface of surfaces of the mirror body other than the planar surface forms a mirror; the reflecting component further comprises a mounting portion provided on the mirror body, and the lens is fixed onto the mirror body through the mounting portion; wherein, the mirror body comprises two inclined planes that are parallel to each other and have a certain tilt angle with respect to the planar surface: one inclined plane is adjacent to a bottom surface of the mirror body and forms a first mirror, and the other inclined plane is adjacent to a top surface of the mirror body and forms a second mirror, wherein the bottom surface is parallel to the planar surface and the top surface is the planar surface, wherein, the second mirror is located on a reflection path of the first mirror; wherein, the mirror body is formed with a notch on a reflection path of the second mirror; the notch has a mounting plane parallel to the planar surface; and the mounting plane serves as the mounting portion for mounting the lens; wherein, the fingerprint sensor is accommodated inside the notch and is provided facing the lens; and a photosensitive surface of the fingerprint sensor is parallel to the mounting plane.