The invention discloses a conversation information preservation method and a phone call terminal, and a cloud server; the method comprises the following steps: dividing a data storage area matched with the phone number in a memory; determining whether the communication line of present calling is connected or not, if yes, controlling a recorder to start so as to record the conversation process, and storing the audio frequency data obtained by the recorder into the data storage area when the present calling is over, thus forming the audio frequency information; forming a contact filling area after the phone number, receiving a contact identifier filled by the user in the contact filling area, combining the contact identifier, the phone number with the audio frequency information so as to form user information, and sending the user information to the cloud server; allowing the cloud server to extract the corresponding contact identifier from the user information, searching a VOIP phone number of the corresponding contact in the database according to the contact identifier, and returning the user information to the phone call terminal of the corresponding contact.