Vehicle-mounted Internet of Things 5G full-band antenna

The utility model discloses a vehicle-mounted Internet of Things 5G full-band antenna, which comprises a circuit board and an antenna structure, the antenna structure comprises a first L-shaped branch knot, a right trapezoid branch knot, a stepped branch knot and a second L-shaped branch knot which are connected in sequence, the first L-shaped branch knot is parallel to the stepped branch knot, the right trapezoid branch knot is respectively perpendicular to the first L-shaped branch knot and the stepped branch knot, and the second L-shaped branch knot is parallel to the second L-shaped branch knot. The stepped branch knot and the second L-shaped branch knot are coplanar; at least one side of the circuit board is provided with a clearance zone, the clearance zone is provided with a feeding point and a parasitic branch, the feeding point is connected and conducted with the first L-shaped branch, and the parasitic branch is arranged close to the feeding point. By using the stepped structure and the right trapez