The invention provides a small reactor secondary loop steam pipeline pressure control method and system. The method comprises the steps that a pressure actual measurement value of a designated row ofsecondary loop steam pipeline, a total load value of a secondary loop and a nuclear power actual measurement value are acquired, acquired signals are processed separately to obtain the processed pressure actual measurement value, a pressure setting valve, the processed total load value and the processed nuclear power actual measurement value, it is judged whether or not the processed pressure actual measurement value is matched with the pressure setting valve of the secondary loop pipeline and the processed nuclear power actual measurement value is matched with the processed total load value of the secondary loop; if not, according to the processed pressure actual measurement value and the pressure setting valve of the secondary loop pipeline, a first opening signal is generated; accordingto the processed nuclear power actual measurement value and the processed total load value of the secondary loop, a second opening signal is generated, and according to the first opening signal and the second opening signal, the pressure of the secondary loop steam pipeline is controlled. The small reactor secondary loop steam pipeline pressure control method and system can achieve the automaticcontrol of the pressure of the small reactor secondary loop steam pipeline well.