The utility model discloses a portable signal flag semaphore trainer. It is including the demonstration and the interaction module that are used for importing signal flag operation control command and carry out information display, a storage module that be used for information processing go forward side by side line control output host system and be used for saving the flag semaphore and training information, the demonstration is connected with interaction module and host system and can be to importing the operation control command of signal flag information in the host system and carrying out information display, storage module also is connected with host system and can be to the data message of input storage in the host system, host system still is connected with and carries out the power of supplying power for control module, host system can read the go forward side by side line control output of training information. After adopting foretell structure, its simple structure, small, settle it in a casing, carry convenient to use, low in manufacturing cost simultaneously, using -way is nimble, can exert the great role in the training of signal flag semaphore.