A method for converting neural network, applied to a terminal device, including: initializing a decision tree, and setting a root of the decision tree; and branching leafs from the root of the decision tree based on effective filters of the neutral network as a decision rule, until all effective filters of the neutral network are covered by the decision tree. The neutral network is a piece-wise linearly activated neutral network. In this method, the neutral network is converted as decision trees and is explained based on the decision trees, so as to solve the black-box problem of the neutral network.