The invention discloses a neural network training method and a device, and a naming entity recognition method and a device. The training method of the neural network used for naming entity recognitionincludes obtaining training text and obtaining labeling information of the training text, wherein, obtaining labeling information of the training text includes: auxiliary labeling for naming entity recognition and naming entity labeling; Inputting a training text to the one or more auxiliary neural networks to obtain auxiliary information for naming entity recognition output by each auxiliary neural network; Inputting the training text and the auxiliary information outputted from at least one auxiliary neural network to the main neural network to obtain the named entity information outputtedfrom the main neural network; The loss of the neural network is calculated based on the auxiliary information output by each auxiliary neural network and the corresponding auxiliary labeling, as wellas the named entity information output by the main neural network and the corresponding named entity labeling, and the neural network is trained according to the loss of the neural network.