The invention discloses a processing device for bonding functional powder to polyester filaments. The processing device comprises a warp shaft, temperature control box bodies, filament guide rollers, a powder mixing blower, an upper vibrating plate, a lower vibrating plate, a powder recycling device and a finished filament winding device. The polyester filaments are led out from the warp shaft and enter a temperature control box body; the polyester filaments are softened by controlling the temperature in the box body; micro-nano functional powder is blown into the box body through the blower; the powder is bonded to the surfaces of the polyester filaments; the polyester filaments in the box body are conveyed and led out from the filament guide rollers and enter the other temperature control box body; the polyester filaments which are bonded with the functional powder pass through the two vibrating plates; the vibrating plates vibrate at a certain frequency to press the polyester filaments, so that the powder and the polyester filaments are bonded firmly; the unbonded powder falls off through small holes in the vibrating holes and is collected; the polyester filaments which are bonded with the functional powder are used for weaving after being wound. According to the processing device for bonding the functional powder to the polyester filaments, the functional powder can be effectively bonded to the surfaces of the polyester filaments; the functionality of the powder is not influenced; meanwhile, the device is simple, easy to maintain and high in work efficiency.