The invention discloses an intersection structure of an intersection and a left circuit control method of the intersection structure. The intersection is provided with a center island (15) and a circuit (5). An entrance section (3) is provided with a first zone (1). An exit section (4) is provided with a second zone (2). When a circuit exit lamp (10) is turned to be red, vehicles are forbidden to drive out of an exit lane (16), and the vehicles parked in the first zone (1) enter the second zone (2) in the manner of simultaneously turning leftwards or turning leftwards in a time delay manner, and afterwards, the vehicles of the second zone (2) enter the circuit (5) to turn leftwards or circuit. When the circuit exit lamp (10) turns to be green, the vehicles can drive towards the exit lane (16) and drive out of the intersection. By means of the scheme, the purpose of intersection roads is definitely planned, the roads are used more flexibly, the traffic capability of dealing with the intersection is improved, the vehicle passing cycle is shortened, the delay time is shortened, and therefore the effect of dredging the blocked intersection is achieved.