The invention discloses a section 
assembly bridge girder erection 
machine suitable for a bridge with a small curve 
radius. The section 
assembly bridge girder erection 
machine structurally comprises amoving frame, a first support, a vehicle head, a vehicle compartment, a beam piece, a second support, a fine adjusting 
system and a third supporting frame. The vehicle compartment is mechanically connected with the vehicle head, a motor is arranged in the vehicle head, the first support is fixedly arranged on the vehicle compartment, and the movable frame is mounted at the top end of the first support. The section 
assembly bridge girder erection 
machine is provided with the fine adjusting 
system, a fine adjusting 
correction system, a step balancing structure and a counterweight 
system, the weight of a base is increased, the stability performance of the base is improved, the 
gravity center is lowered, meanwhile adjustment on the 
gravity center can be conducted according to the fine adjusting 
correction system, the section assembly bridge girder erection machine is suitable for any bridge, particularly overlapping joint of beam pieces of the bridge with the small curve 
radius, when the third supporting frame is unfolded and fixed, the base is stable, the 
gravity center is low, adding of assistance of external force is not needed, the fixing time is shortened, and the 
time cost is reduced.