Fuente: WIPO "industrial hemp" The invention discloses an industrial hemp chromosome doubling method. The invention provides an industrial hemp chromosome doubling method which comprises the following steps: carrying out chromosome doubling treatment and culture on industrial hemp seedlings by using oryzalin or a herbicide taking oryzalin as an active component to obtain chromosome-doubled industrial hemp and realize chromosome doubling of the industrial hemp, the use concentration of the oryzalin is 35M. Experiments prove that the commercialized Surflan with the main component being oryzin is used for treating the growing points of the industrial hemp seedlings, operation is easy, and the efficiency of obtaining the industrial hemp tetraploid is high.