The invention discloses a fault diagnosis method for a hydraulic pump of an electro-hydrostatic actuator. The method comprises the following steps: firstly, acquiring a vibration signal on a hydraulicpump shell of the electro-hydrostatic actuator or a pressure signal at an outlet of a hydraulic pump by utilizing a vibration acceleration sensor or a pressure sensor, constructing a feature vector based on a wavelet packet decomposition technology, and encoding a fault type of the hydraulic pump of the electro-hydrostatic actuator to serve as a training output sample; acquiring a vibration signal data set or a pressure signal data set of a hydraulic pump of the electro-hydrostatic actuator; optimizing model hyper-parameters C and delta of the support vector machine automatically by using aquantum particle swarm algorithm; obtaining the values of the optimal hyper-parameters C and delta, substituting the values into a support vector machine model, and training the support vector machinemodel of the optimal hyper-parameters by utilizing the feature vectors extracted from the training data set of the electro-hydrostatic actuator hydraulic pump and the fault codes corresponding to thefeature vectors; and finally, carrying out electro-hydrostatic actuator hydraulic pump fault diagnosis on the electro-hydrostatic actuator hydraulic pump test data set.