To study the effects of urban surface runoff colloid on migration behavior of heavy metals in infiltration facilities, colloids in the road runoff were extracted and infiltration column experiment was employed to investigate the outflow mass concentration variation in infiltration and migration of Cu²⁺, Pb²⁺ and Cd²⁺ under coexistence of runoff colloid. Besides, the influence of water flow rate, pH, sodium concentration, coexisting metal ions and colloid particle size on migration behavior of heavy metals carried by colloids were analyzed. The results show that the infiltration and migration of heavy metals were promoted by runoff colloids. The higher the water flow rate was, the carrying migration of heavy metals by runoff colloid was more obvious. Weak acid condition was more favorable to the carrying migration of heavy metals by runoff colloid. The infiltration and migration process of heavy metals carried by the colloid would be inhibited with the coexistence of Na⁺ and various heavy metals in rainfall runoff. Besides, the higher the ion concentration was, the inhibition effect was more obvious. The colloid particle size could significantly affect the carrying capacity of heavy metals by runoff colloid where smaller colloid particle size contributed to easier infiltration and migration of heavy metals.