The invention discloses a signature method for resisting injection attack. In order to solve the problem that the random number encounters the injection error attack in the digital signature process,one bit of the random number is modified, so that the method of judging whether the point of the elliptic curve is on the elliptic curve can not be used to determine whether the digital signature issubjected to the injection error attack in the digital signature process. The method comprises: calculating a digital signature value of a message to be signed according to a first parameter; constructing a temporary variable according to the digital signature value and the first parameter; determining a first coordinate point according to the temporary variable and the elliptic curve base point coordinates; determining a second coordinate point according to the elliptic curve scalar multiplication operation and the elliptic curve base point coordinates; if it is judged that the first coordinate point coincides with the second coordinate point, the digital signature value is output. The invention also discloses a signature device resistant to injection attack, a mobile terminal and a computer-readable storage medium.