The invention relates to a net brick, which is mainly characterized in that: netty multidirectional channels which are vertically, horizontally and uprightly intercrossed spatially, run through each other and are communicated with the surface of a brick body are arranged inside the brick body, and a thin-shell arched net structure is formed in the brick body. The brick body can meet mechanical bearing requirements, and simultaneously the surface area of the brick body, the internal volume and the internal carrying capacity of the brick body are increased. Under the condition of combined use of net bricks, multidirectional channels in the brick body can be intercrossed, thereby the shape of a layered net can be formed; moreover, opposite directions of the channels are abundant, thereby brick net structures with different shapes and types can be formed; the net brick also is characterized by ventilation, aeration and water permeability. Furthermore, the net brick has multiple functions and wide application range and can have multiple uses with one brick, be effectively applied in different fields and play different roles.