The invention provides an information acquisition release system and a method for guiding a left-hand turning vehicle to pass through an intersection. The system comprises a central control unit, a first sensor, a second sensor and a display device, the central control unit is respectively connected with the first sensor, the second sensor and the display device and used for processing traffic information, the first sensor is located at a T*V distance position of an opposite through lane stop line and used for acquiring entry time point and driving speed of a straight driving vehicle which enters into the intersection, the T represents an absolutely safe vehicle clearance, the V represents a design speed of the road where the vehicles drive, the second sensor is located at a position of the opposite through lane stop line and used for detecting straight driving vehicles which pull out, and the display device is used for displaying opposite through lane vehicle information. By means of the system and the method, suggestion information is provided for the left-hand turning vehicle to determine the left-hand turning, a left-hand turning driver can be aided in determining vehicle clearances of the straight driving vehicles, the traffic capacity of the intersection is improved, and dangerous conflicts between the left-hand turning vehicle and the straight driving vehicles are reduced.