The invention discloses a method for testing and verifying information flow among spacecraft. The method comprises the following steps: extracting information flow corresponding to each signal to be tested among the spacecraft according to a test requirement, and extending the extracted information flow according to different signal features of the signals to be tested; generating test cases by adopting different methods according to different signal features respectively; testing the information flow of each signal to be tested among the spacecraft by using the generated test cases to obtain a test result. By adopting the method, information flow test among the spacecraft is realized, and a rapid and effective test method is provided for testing among the spacecraft.