The whole load test of 3 external prestressed concrete two-span continuous beams was carried out. The test results show that the continuous beam is in the elastic stage before the concrete cracks in the tension area under self-loading, and the measured values of the side support, the reaction force of the middle support, the bending moment of the middle span section and the middle support section are close to the calculated values using the elastic theory. The measured values of the side support reaction and the moment of the mid-span section start to deviate to the direction larger than the calculated value of the elastic theory. The measured values of the reaction force of the middle support and the bending moment of the section of the middle support deviate to the direction less than the calculated value of the elastic theory. When the tensile non-prestressed tendons in the beam yield, the deviations between the measured reaction force of the side support and the middle support and the measured bending moment of the middle span section and the middle support section and the calculated values of the elastic theory increase further, and the deviations reach the maximum when the test beam is damaged. The bending moment redistribution values of the three test beams are 12.8%, 16.9% and 14.6%, respectively. The measured values are also compared with the calculated values of bending moment redistribution in 4 different design codes. The results show that the bending moment redistribution values calculated by ACI 318-95 and GB 50010-2010 are both smaller than the measured values. The predicted values of the Canadian A23.3-M84 code are the closest to the test values, except for a beam numbered B5; The British BS8110 specification is not safe. In practical design, the bending moment redistribution of external prestressed concrete continuous beams can be calculated according to the Chinese standard formula, but the ultimate stress of external prestressed tendons must be reasonably determined.