Air inlet system based on modular design and vehicle

The invention relates to an air inlet system based on modular design and a vehicle, the air inlet system comprises an air filter assembly, the air filter assembly comprises a lower box body, the top of the lower box body is provided with a plurality of mounting points, and the mounting points are symmetrically arranged about the axis of the lower box body; the upper cylinder body is of a central symmetry structure, the upper cylinder body is fixed to the lower box body through the multiple installation points, the interior of the upper cylinder body communicates with the interior of the lower box body, and one end of the upper cylinder body is provided with a first air outlet communicating with the interior of the upper cylinder body; and the first air inlet is formed in one side of the lower box body, and the first air inlet is communicated with the interior of the lower box body. When the air filter assembly needs to be adjusted from the left side to the right side or from the right side to the left side of