The invention provides a preparation method of
arsine. The preparation method comprises the following steps: carrying out a mixed reaction on raw materials including
calcium hydride and
arsenic trichloride in a vacuum environment under a condition of a
water content of less than 100 ppm to obtain
arsine. According to the method, the difficulty in water removal in purification is avoided, and the
water content problem of the produced
arsine is solved;
calcium hydride reacts with
arsenic trichloride, so that the problem of incomplete arsine generation in an arsine production process in the priorart can be effectively solved; preferably in order to further solve the problem of a large amount of
arsenic-containing waste liquids generated in an arsine production process, a specific
organic solvent is adopted, and is recycled through a
distillation method, so that the generation of the arsenic-containing waste liquid is greatly reduced; and by adopting the preparation method provided by theinvention, the problems of incomplete reaction, damage of arsenic-containing waste liquid to the environment and the like in the traditional method are solved, and rapid and efficient industrial production can be realized.