The application provides a visual device for rock single fracture solute migration under cyclic temperature variation, comprising: a transparent fractured rock
mass, comprising upper and lower transparent fractured rock masses each provided with a rough fracture surface, and the upper and lower transparent fractured rock masses are placed in opposition to form a single fracture channel; a cyclic temperature variation
assembly for simulating the cyclic temperature variation phenomenon in a
natural environment; a solute concentration monitoring
assembly for injecting a fluorescent
reagent solution into the single fracture channel, visualizing the solute migration in the single fracture channel based on
laser-induced
fluorescence, and monitoring the solute concentration in the single fracture channel; a fracture
temperature monitoring assembly for monitoring the temperature change inside the single fracture channel under the cyclic temperature variation based on a
fiber Bragg
grating sensor; and a
data processing unit connected with the cyclic temperature variation assembly, the solute concentration monitoring assembly and the fracture
temperature monitoring assembly. The application can simultaneously visualize and monitor the solute exchange concentration, flow characteristics and thermodynamic characteristics in the fracture.