The invention discloses a vertical net laying system for honeycomb porous structure cotton. A top inlet of a cotton supply channel is communicated with a filament introduction region, forward and reverse filaments introduced in the filament introduction region are perpendicular to weaving bodies passing through the cotton supply channel, a bottom outlet of the cotton supply channel is communicatedwith the top face of a horizontal conveyor belt under the channel through a cotton discharge channel, left and right reciprocating rollers at the two sides of the cotton supply channel include reciprocating roller bodies and multiple reciprocating needles arranged on the roller bodies, the reciprocating needles can include breathable needles so as to be communicated with roller inner cavities inside the reciprocating roller bodies, and left and right cotton discharging portions on the two sides of the cotton discharge channel are each composed of multiple needle rollers sequentially distributed from top to bottom. Due to the design, the weaving and crossing effect is high, the internal structure of weaving bodies can be changed, the functionality is high, the weaving bodies of the porousstructure are formed, the arranging effect on the interiors and exteriors of the weaving bodies is high, and the structure uniformity and surface flatness of the weaving bodies can be improved.