Information transmission method and device of digital cable

The invention provides an information transmission method and device for a digital cable, and is applied to the technical field of data transmission. Gathering digital analog codes, analyzing and decoding the digital analog codes and converting the digital analog codes into digital analog signals, recording single transmission parameters of the digital analog signals and recording the single transmission parameters as first transmission parameters, recording continuous transmission parameters of the digital analog signals and recording the continuous transmission parameters as second transmission parameters, and obtaining a balance interval value of a maximum instant amplitude value and a minimum instant amplitude value; obtaining a balance interval value domain of the maximum instantaneous amplitude value domain and the minimum instantaneous amplitude value domain; limiting the information transmission amplitude value of the digital cable according to the balance interval value of the maximum instant amplitu