An under-screen biometric identification apparatus, applicable to an electronic device having a display screen, comprising: a lens, comprising at least one aspherical lens, the lens disposed under a display screen, for receiving an optical signal formed by reflection of a human finger on the display screen, wherein the optical signal is used to detect biometric information of the finger; a lens barrel for holding the lens, and configured to be connected to an external support; and an imaging chip, disposed under the lens barrel for receiving an optical signal passing through the lens, and configure to perform optical imaging based on the optical signal so as to obtain a fingerprint image; wherein the lens barrel comprises a focusing thread formed on an outer surface of the lens barrel, and the focusing thread is used for adjusting a distance between the lens and the imaging chip, wherein the lens barrel and the support are threadedly connected through the focusing thread; wherein a middle frame of the electronic device is provided with a hole formed in a mounting area of the under-screen biometric identification apparatus, an upper surface of the middle frame is provided with a bevel angle formed by chamfering processing at an edge of the hole, and the bevel angle enables a width of the hole on the upper surface of the middle frame to be greater than a width of the hole on a lower surface of the middle frame, an upper surface of the support is fixedly connected to an area of the lower surface of the middle frame that is located around the hole, so that the under-screen biometric identification apparatus is disposed under the display screen in a non-contact manner and is not in contact with a lower surface of the display screen, and a gap is formed between the under-screen biometric identification apparatus and the display screen, and the under-screen biometric identification apparatus is completely decoupled to the display screen, so that the display screen is not damaged when the under-screen biometric identification apparatus is disassembled. a lens, comprising at least one aspherical lens, the lens disposed under a display screen, for receiving an optical signal formed by reflection of a human finger on the display screen, wherein the optical signal is used to detect biometric information of the finger; a lens barrel for holding the lens, and configured to be connected to an external support; and an imaging chip, disposed under the lens barrel for receiving an optical signal passing through the lens, and configure to perform optical imaging based on the optical signal so as to obtain a fingerprint image; wherein the lens barrel comprises a focusing thread formed on an outer surface of the lens barrel, and the focusing thread is used for adjusting a distance between the lens and the imaging chip, wherein the lens barrel and the support are threadedly connected through the focusing thread; wherein a middle frame of the electronic device is provided with a hole formed in a mounting area of the under-screen biometric identification apparatus, an upper surface of the middle frame is provided with a bevel angle formed by chamfering processing at an edge of the hole, and the bevel angle enables a width of the hole on the upper surface of the middle frame to be greater than a width of the hole on a lower surface of the middle frame, an upper surface of the support is fixedly connected to an area of the lower surface of the middle frame that is located around the hole, so that the under-screen biometric identification apparatus is disposed under the display screen in a non-contact manner and is not in contact with a lower surface of the display screen, and a gap is formed between the under-screen biometric identification apparatus and the display screen, and the under-screen biometric identification apparatus is completely decoupled to the display screen, so that the display screen is not damaged when the under-screen biometric identification apparatus is disassembled.