The invention provides a USB based on a Type C. The USB comprises a housing, an upper insertion assembly and a lower insertion assembly. The upper insertion assembly comprises an upper insulation body and an upper row of conductive terminals. The lower insertion assembly comprises a lower insulation body, a metal shielding layer and a lower row of conductive terminals. The metal shielding layer and the lower row of conductive terminals are integrally molded. The lower row of conductive terminals comprises lower grounding terminals. Abutting portions of the lower grounding terminals comprise plate-shaped grounding basal bodies and grounding portions formed through projecting downwards from the basal bodies. The grounding portions and the grounding basal bodies are in different planes. The grounding basal bodies are arranged in the lower insulation body. The grounding portions are exposed outside the lower insulation body, and are used for contact with grounding terminals for abutting the USB; and the grounding basal bodies and main body portions of the lower grounding terminals are widened portions. Through adoption of the USB of the invention, the part composition of the product can be reduced; the reliability of the product when heavy currents pass can be raised; and the simplicity can also be raised.