The invention discloses an automatic component inserter for an electronic circuit board. The inserter comprises a component inserter, wherein a main bracket is arranged on the upper side of the inserter, an observing hood is arranged in the main bracket, the inserter is slidingly connected to a V-shaped guide block through a V-shaped guide slot, the upper end surface of the V-shaped guide block isfixedly connected to a hinge seat, a connecting block is rotatably connected to the inner side of the hinge seat through a first rotary shaft, brackets are slidably connected to two sides of the connecting block symmetrically through the first chutes, an arc-shaped groove and a limiting groove are formed in the right upper side of each bracket, limiting blocks are slidably connected in the upperand lower sides of the bracket, a compression spring is fixedly connected to the upper end surface of each limiting block, and the lower end of the limiting block is fixedly connected to a limiting insertion shaft. According to the automatic component inserter for the electronic circuit board, dust on the inner and outer surfaces of the observing hood are adhered, and a sliding roller can be locked to the left side of the component inserter, so that the roller with new dust adhesion paper is replaced conveniently, and the pitch of the dust adhering structure of the roller is adjusted.