The invention discloses a coal-bed gas well annular pressurizing pulverized coal dredging device and method, and belongs to the technical field of dredging sediments such as pulverized coal, coal slime and sand in a coal-bed gas well. The coal-bed gas well annular pressurizing pulverized coal dredging device comprises an oil tube, a sand dredging pump and a sleeving, wherein the sand dredging pumpis connected to the lower end of the oil tube and communicates with the oil tube; and the sleeving is arranged on the exteriors of the oil tube and the sand dredging pump in a sleeving mode; an annular space is formed between the oil tube as well as the sand dredging pump and the sleeving; and an annular pressurizing device connected with the oil tube in a sealed mode is further arranged at the lower end of the oil tube, and the annular space formed between the oil tube as well as the sand dredging pump and the sleeving is sealed through the annular pressurizing device. With adoption of the coal-bed gas well annular pressurizing pulverized coal dredging device and method, not only is the pump efficiency of the sand dredging pump improved, but also the sediments (especially the pulverizedcoal) such as the pulverized coal, the coal slime and the sand in a wellbore of the coal-bed gas well can be thoroughly cleaned up.