<p>Flow freezing through single fracture is involved in the rock engineering of cold regions; suspended particles in the flow have a significant influence on the ice–water two-phase evolution. A systematic visualization apparatus is developed to perform the freezing–seepage coupling experiments, including a refrigeration system, an image acquisition system, a fluid delivery system, a data acquisition system, and transparent fracture sample. Based on the freezing–seepage coupling results with consideration of different flow rates and suspended particle contents, the lateral water near the outlet is prone to freezing with equal rates in the horizontal and vertical directions at early stage, later the horizontal growth gradually becomes dominant. Especially, the phenomenon of inter-melting in the fracture may occur after approximately 9&#xa0;h. Under constant flow rate and time, the ice-phase area generally decreases with increasing suspended particle content in most cases. With consideration of the flow rate and suspended particle content, all freezing patterns can be classified into three types: Mild Collision State (MS), Transitional State (TS), and Intense Collision State (IS). For the seepage flow, the pressure difference increases with flow rate, and the rate increases with the freezing time, while the suspended particle content is constant. From the migration of suspended particle based on Archimedes number, the enhancement of particle mobility can suppress the development of the ice-phase region.</p>