The dual machine series 200 type high-pressure Roots blower is composed of two Roots blowers connected in series. The main units of the two-stage blowers are driven by the same motor through belt drive or dual axis extension motor direct connection. When the gas enters the first stage blower for boosting, it is cooled down to below 40 ℃ by the intermediate cooler, and then enters the second stage blower for further boosting. The unit can achieve a high boosting pressure of up to 200kPa