HF pressure type weighing coal feeder is based on electronic belt weigher and combined with the special needs of positive pressure coal feeding, metering and control process of circulating fluidized bed boiler. It is a strictly sealed pressure coal feeding equipment with multiple functions of conveying, measuring, controlling and pressure resisting. It is suitable for the positive pressure direct blowing feed system with turbulent flow field in the furnace and the requirements of fast bed positive pressure fluidized bed boiler. It has simple structure, convenient maintenance and can realize continuous, uniform and reliable coal feeding. In the whole operation process, not only the material can be weighed, but also the instantaneous value of coal feeding amount and cumulative measurement can be displayed. Moreover, it can automatically adjust the coal feeding rate according to the instruction of the boiler combustion control system and control the coal feeding rate to meet the requirements of the boiler load. It can effectively improve the fluidization of boiler materials, adjust the load quickly, adjust the proportion of solid materials easily, control the boiler bed temperature more conveniently, make the fuel and desulfurizer mix more fully, and facilitate the full desulfurization. Continuous coal feeding, accurate weighing, stable operation and energy saving. It can also realize open-loop and closed-loop flow control and plant area network management according to user requirements.