In order to obtain dynamics parameters for the purpose of crystallization process design and modeling of rubidium chloride, it was investigated that crystallization metastable zone width and growth kinetic of rubidium chloride. The turbidity meter was used to detect the metastable zone width of the aqueous solution system under different linear cooling in an isothermal batch cooling experimental device. And the desupersaturation of rubidium chloride solution with time was measured by adding seed crystal to supersaturated solution at a certain temperature. The metastable zone width of the system increase with the increase of saturation temperature, decrease with the increase of stirring rate, and increase with the increase of cooling rate. The nucleation order and nucleation rate constant of rubidium chloride were obtained by the self-consistent equation of metastable zone width. The nucleation order value is less than 3, indicating that it is instantaneous nucleation. The nucleation order and nucleation constant both increase with the increase of saturation temperature, indicating that the nucleation rate increased with the increase of temperature. When the amount of seed added exceeds a certain amount, the supersaturation of the solution decreases rapidly. According to the supersaturation curve, the growth kinetics of rubidium chloride crystal were calculated. And the growth exponent is about 2 in the experimental temperature range. The constant of crystal growth rate increases with the increase of crystallization temperature.