Device and method for increasing water content of materials evenly

The invention discloses a device and method for increasing the water content of materials evenly. The device for increasing the water content of materials evenly comprises a conveying net belt used for conveying materials, an air temperature and humidity regulating device, a humidifying cavity, a positive-pressure air injection structure and a negative-pressure system, wherein the air temperature and humidity regulating device is used for stabilizing and regulating the temperature and humidity of air in the humidifying cavity, multiple groups of nozzles are arranged on the upper portion of the humidifying cavity and located above the conveying net belt, multiple spraying and blowing pipes which are arranged side by side and are used for spraying and blowing positive-pressure air continuously are arranged in the humidifying cavity and located below the conveying net belt, strip-shaped openings are formed in the spraying and blowing pipes, the spraying and blowing openings face the conveying net belt, the negative pressure system is a hollow cover which changes gradually from the square upper end to the round lower end, and a structure formed by combining an upper spherical pore plate and a lower spherical pore plate is arranged in the central area of the interior of the hollow cover and is fixed to the inner wall of an air suction cover through two wing type structures.