The invention provides a device for turning over a steel truss girder member. The device comprises two turnover pedestals, a turnover frame and two traction devices. The device is characterized in that the turnover frame and the two traction devices are arranged between the two turnover pedestals; the turnover frame is provided with a circular arc shaped girder; three separate traction lugs are arranged outside the circular arc shaped girder; a hoop for fixing the steel truss girder member is arranged inside the circular arc shaped girder; and the two traction devices are respectively arranged at the two sides of the horizontal diameter of the circular arc shaped girder and are connected with different traction lugs via steel wire ropes. A method for turning over the steel truss girder member based on the device is characterized by tightening one steel wire rope of one traction device and loosening the other steel wire rope of the other traction device to axially turn over the turnover frame at an angle of 90 degrees every time and turning over the turnover frame twice to realize 180-degree turnover. The device and the method have the following beneficial effects: the device is safe and convenient to operate and has stronger turnover controllability; the turned over steel truss girder member is free from wear and the connecting plates are free from deformation; the device has high construction efficiency and low labor intensity; and the construction cost can be reduced and the practicability is greatly improved.