The invention relates to a steady-state target offset system and method for correcting deviation in shield tunnel construction. The steady-state target offset method for correcting the deviation in the shield tunnel construction comprises the steps that a design axis and real-time deviation information of the tunnel construction are obtained; the chord height from the assembled duct piece axis center to the design axis is calculated when a notch and a shield tail of a shield tunneling machine are located on the design axis according to a current stroke of the shield tunneling machine; corresponding proportionality coefficients are arranged according to the side of the shield tunneling machine, and the chord height is converted to a steady-state target offset value of the shield tunneling machine according to the proportionality coefficients; and relative deviation information of the shield tunneling machine is obtained according to the steady-state target offset value and the real-timedeviation information. According to the steady-state target offset system and method for correcting the deviation in the shield tunnel construction, accurate parameters and models are provided for the steady-state target offset value of the shield deviation correction, a reasonable quantitative basis is provided for judging a current ring transient state target, and the steady-state target offsetmethod for correcting the deviation in the shield tunnel construction is one of the technological bases for realizing artificial intelligent shield deviation correction.