The invention provides a device for accelerating salt obtaining by evaporating brine. The device comprises a light-heat conversion part, a 
buoyancy ball and a locking part, wherein the light-heat conversion part wraps the 
buoyancy ball, and the locking part fastens the light-heat conversion part. The invention further provides a method for accelerating salt obtaining by evaporating brine. The method comprises the following steps that an 
aqueous solution to be treated is added, accessories are selected and assembled, the light-heat conversion part wraps the 
buoyancy ball and is fastened by using the locking part, the device is placed in a 
water pool, the buoyancy ball floats in the 
water pool, the remaining part of the light-heat conversion part stretches into the 
water pool to carry out light absorption and light-heat conversion so as to quickly evaporate water absorbed by the light-heat conversion part, the light-heat conversion part carries out 
capillary action to quickly supply water. The device and method disclosed by the invention have the beneficial effects that the use effect is excellent, the water 
evaporation efficiency can be improved, the production period of salt obtaining by evaporating brine in the 
open air can be shortened, and the 
treatment time of multiple 
sewage such as high-salt waste water, heavy-
metal sewage and printing and 
dyeing sewage can be shortened,so that large economic benefit and social benefit can be brought.