Built-in terminal positioning structure

The utility model discloses a built-in terminal positioning structure, which comprises a first component, a second component and a third component, the first component is provided with a first insertion cavity for the second component to be inserted, the second component is provided with a second insertion cavity for the third component to be inserted, the end part of the second component is provided with at least one elastic sheet, and the elastic sheet is arranged in the first insertion cavity. A preassembling hole and a locking hole are sequentially formed in the elastic piece in the length direction of the elastic piece, a protrusion matched with the preassembling hole or the locking hole is fixedly arranged in the first inserting cavity, a positioning groove is formed in the outer portion of the third part, and an elastic clamping jaw matched with the positioning groove is further arranged in the first inserting cavity. The second part is further provided with a limiting piece enabling the elastic clampi