The utility model relates to a movable emission system belonging to emission device for discharging powder or chemical active material in forest plant diseases and insect pests biological control field, which comprises a breechblock, a percussion mechanism and a launching tube end frame; wherein, the breechblock is welded with a powder chamber; the percussion mechanism is connected with an antipriming pipe which is connected to the powder chamber; both ends of the antipriming pipe are respectively connected with the lo-plugging saw-tooth screw thread of the percussion mechanism to form into an assy and then the assy is connected with the launching tube; the launching tube is connected with an elevating device; the insecticide powder spore in the powder chamber is arranged at one end of the end frame at the bottom of the launching tube; the end of the end frame is provided with the breechblock and the other end with the elevating device; a damper is positioned under the breechblock. The utility model is characterized by overcoming disadvantages of airplane and manual prevention and control such as high labor intensity and manpower and material resources waste; quickly installing mobile emission system on the spot for emitting insecticide powder spore at places with complex surface configuration or too narrow for vehicle to get to. The utility model has the advantages of novel, simple and reasonable structure, low cost, safety and steadiness, thereby reaching the goal of effective pest control.