The utility model provides a pipeline structure and seal air system for coal pulverizer. Wherein, the pipeline structure includes: the main line, a plurality of connecting lines, a plurality of connecting lines are connected with a plurality of sealing fan one -to -ones, and each connecting line all includes first crooked pipeline section, and each is connected pipeline through and crosses first bent pipe section and be connected with the main line, and each first crooked pipeline section is all to the first direction protrusion. The utility model discloses can solve among the prior art problem that junction loss of pressure is big of connecting line and main line.