At present, few studies have been conducted on turbulence characteristics of stratified flow in braided rivers. In this study, a physical model experiment was carried out to study the variation of the turbulent intensity of thermally stratified shear flow with different velocity ratios of two layers and width ratios of two anabranches. The results show that, as the velocity ratio decreased, the stratified flow in the braided river changed from stratified flow to neutrally stratified flow. As to the neutrally stratified flow, the sectional high-turbulence zone along the anabranches changed from a C-type distribution to an inverse C-type distribution, and the turbulent intensity was mixed well throughout the section in the end. With the increase of the channel width, the section of the high-turbulence zone appeared later, and the quantity of the turbulent intensity increased. Under other conditions of stratified flow, the range and quantity of high turbulent intensity all changed. At the confluence section, the flow in the center of the section was mixed violently in the symmetric braided river. With the increase of the velocity ratio, the quantity of the turbulent intensity decreased. The high turbulent intensity zone moved to the narrowed left anabranch in the non-symmetric braided river, which was associated with the tail position of the mid-bar.