The invention discloses a method for producing polycrystalline and industrial silicon used for organic silicon. The method comprises the following steps of: grinding poor-quality metallurgy-grade silicon to 100-400 meshes; carrying out wet magnetic separation on the ground metallurgy-grade silicon at the magnetic field intensity of 3000 Oster-18000 Oster so as to remove magnetic impurities in silicon powder through a magnetic separation method; and then combining ultrasonic washing to soak and wash the magnetic powder without the magnetic impurities in a hydrochloric acid solution, a chloroazotic acid solution and a hydrofluoric acid solution in turn; and washing and drying the silicon powder subjected to acid washing, thus the purity of the obtained silicon powder reaches the requirements of polycrystalline and industrial silicon used for organic silicon.