The invention provides a large die forging press beam feeding speed predictive control method based on BP neural networks. The method includes the following steps that 1, model parameters are initialized, and then the prediction neural network and the control neural network are trained in an off-line mode according to a historical die forging technology; 2, prediction output of the next moment is given by the prediction neural network; 3, feedback compensation is conducted on prediction output, and a die forging technology reference value of the next moment is planed; 4, according to the feedback correction value and the die forging technology reference value, input of the current moment of the system is given by the control neural network; 5, die forging technical data of the current moment is perceived on line, and the control neural network and the prediction neural network are adjusted according to current data feedback; 6, the step 2 is executed, and large die forging press beam feeding speed predictive control of the next moment is conducted. The large die forging press beam feeding speed can be predicted fast and accurately on line, and a theoretical basis and technological support are provided for effectively controlling a large die forging press.