Engine air inlet channel, engine and vehicle

According to the engine air inlet channel, the engine and the vehicle, the engine air inlet channel comprises a derivative air channel and a main air channel, the derivative air channel comprises a first end and a second end which are opposite in the length direction, and the derivative air channel further comprises a first molded line and a second molded line which are opposite in the height direction; the main air channel comprises a third end and a fourth end which are back to back in the length direction, and the third end is communicated with the second end; the main air passage further comprises a third molded line and a fourth molded line which are opposite in the height direction, the third molded line is connected with the first molded line and has an inclined included angle, the fourth molded line is connected with the second molded line and has an inclined included angle, and the derivative air passage is inclined relative to the main air passage, so that a more stable initial flow characteristic can be realized; and the air inlet direction can be restrained according to design requirements, so that the tumble ratio is increased.