The invention relates to a eupatorium lindleyanun tablet and a preparation technology. A formula of the eupatorium lindleyanun tablet is characterized by comprising the following components, by weight: 5000g of eupatorium lindleyanun, 55g of aluminium hydroxide, 4g of magnesium stearate and 2g of powdered steatile. The preparation technology is realized through the following steps: crushing 5000g of eupatorium lindleyanun into a meal; carrying out heat reflux extraction by 80% ethanol for three times with 3 h for each time; merging the extracts; filtering; steaming a filtrate to remove ethanol; carrying out insulation filtration while hot; concentrating the filtrate into a stiff paste; drying with reduced pressure; adding a proper amount of accessories to prepare into particles; compacting into 1000 tablets; coating a film to obtain the finished tablet. The process is practical and simple, and has high dry paste yield and high general flavone content; the tablet has efficacies of reducing phlegm, relieving cough and preventing asthma, and can be used for chronic bronchitis, excessive phlegm and cough.