The utility model discloses a horizontal turning system for bridge construction and relates to the field of bridge turning construction. The system comprises an upper turning table and a lower turning table which are oppositely arranged, wherein an upper ball hinge is fixedly connected to the bottom of the upper turning table; a lower ball hinge is fixedly connected to the top of the lower turning table; four supporting legs are arranged at the bottom of the upper turning table and are uniformly distributed on the circumference where the upper turning table serves as the center; an included angle between the connecting line of two opposite supporting legs and the central line of a main beam is 45 degrees; two counterforce seats and an annular slide way are arranged at the top of the lower turning table; the annular slide way is matched with the supporting legs for use; the counterforce seats are positioned on the outer side of the annular slide way and are externally tangent to the upper turning table; the distance between the two counterforce seats is equal to the diameter of the upper turning table; a traction device and an auxiliary pulling device are arranged at the top of each counterforce seat. According to the horizontal turning system, the lower ball hinge and the two supporting legs positioned on the ballasting sides of a beam body form three-point stress, and the stability is relatively high; the lifting weight of a jack is relatively light, and the cost can be effectively reduced.