The invention discloses a noise generation method which includes the following steps: according to a noise parameter obtained beforehand, an initial value of a reconstruction parameter is obtained; according to the initial value of the reconstruction parameter, random value-taking scope is obtained; in the random value-taking scope, a value is picked by random as a reconstructed noise parameter; according to the reconstructed noise parameter, noise is obtained. The invention also discloses a noise generation device which comprises: an initial value unit used for obtaining the initial value ofthe reconstruction parameter according to the noise parameter obtained beforehand; a scope unit used for obtaining random value-taking scope according to the initial value of the reconstruction parameter; a reconstruction unit used for picking value by random as a reconstructed noise parameter in the random value-taking scope; an integration unit used for combing noise according to the reconstructed noise parameter. The method can be applicable to various standard protocols and cause that more comfortable noise can be decoded for a user in a decoding end.