Abstract: An environmental-friendly paintbrush without bristle-implanting holes includes a handle, a bristle-implanting brush head, and a metal plate. The bristle-implanting brush head may have one end provided with a bristle material-laying trough, and another end connected with the handle. A plastic block may be placed inside the bristle material-laying trough. Bristle material may be filled in an interstitial space between the plastic block and the bristle-implanting brush head. The plastic block is formed with a metal-laying trough. The metal plate is set inside the metal-laying trough. Two ends of the bristle material-laying trough are formed with metal slots provided inside the brush-implanting brush head. Two ends of the metal plate are slotted into the metal slots. A method of processing an environmental-friendly paintbrush without bristle-implanting holes is also disclosed.