Based on the principle of local scour of bridge piers, and on the basis of the anti-scour measures of horizontal collars, a new anti-scour protection measure, called ridged collar, which can change the water flow around the piers was designed. In order to explore the protective effect of the ridged collar on the local scour of cylindrical bridge piers, indoor physical model tests were conducted using ridged collars of different shapes, and the scour characteristics and hydraulic properties around the pier were studied. The test results show that, the protection effect is the best for a ridged collar installed on the bed surface with a height of 1 cm and an angle of 135°. Compared with cases of no protective measures, after the ridged collar is installed on the bridge pier, the maximum scour depth reduction can reach 62.2%, and the vertical flow velocity and vertical turbulence intensity at the bottom of the pier can be significantly reduced. Through multivariate analysis, an empirical equation for calculating the non-dimensional maximum scour depth around the pier is established, which is applicable to both open channel flows and flows under ice sheet.