High-gain microstrip antenna array, millimeter wave vehicle-mounted radar sensor and vehicle

The invention discloses a high-gain microstrip antenna array, a millimeter wave vehicle-mounted radar sensor and a vehicle, the antenna array comprises an antenna unit, a feed line, an excitation port, a dielectric substrate and a metal floor, the antenna unit, the feed line and the excitation port are arranged on the front surface of the dielectric substrate, the metal floor is arranged on the back surface of the dielectric substrate, and the metal floor is arranged on the back surface of the dielectric substrate. The feeder line comprises a first feeder line and a second feeder line; the number of the antenna units is N * M, and every M antenna units are arranged and distributed at equal intervals; in every M antenna units, two adjacent antenna units are connected through a first feeder line, and the last antenna unit is connected with the excitation port through a second feeder line; each antenna unit comprises a radiation structure and two parasitic structures, and the two parasitic structures are symmetr