The invention relates to a bit coin transaction transfer method and a bit coin transaction transfer system. The bit coin transaction transfer method is characterized by comprising a network type judging step in which the network type of a bit coin network is judged, an initializing step in which a bit coin wallet object is initialized using network parameters corresponding to the network type according to the network type judged in the network type judging step, a key generating step in which a user private key and the network parameters are combined to generate a new key and the new key is added to the bit coin wallet object, and a signature and transfer step in which transfer transaction data is signed locally using the new key in the bit coin wallet object and the signed transfer transaction data is uploaded to the bit coin network to realize bit coin transfer transaction. By using the method and the system of the invention, the user's privacy can be protected effectively, and the security of bit coin transfer can be improved.