It is a staircase-type access system for disabled comprising, • Lower platform, • Upper rail, • Lower rail as basic elements and • An upper step-piece, • An intermediate step-piece, • A step-piece fixed to the lower platform, • A connection element of the step-pieces connected on one end to the lower platform, and on the other end to an upper rail vertical support element, • A connection element for a step motion transmission feature, connected on one end to the upper rail vertical element, and on the other end to the intermediate vertical support element, • Step motion transmission features connected on one end to the connection element of the step motion transmission feature, and on the other end to the upper step-piece, the intermediate step-piece and the step-piece fixed to the lower platform, • A hinge connection located between the lower platform and the connection element of the step-pieces, enabling the angle between the lower platform and the connection element of the step-pieces to change, and the upper step-piece, the intermediate step-piece, the step-piece fixed to the lower platform and the lower platform to move parallel to the ground during the vertical elevation and descent of the disabled access system, • A motion and power transmission arm connected on one end to the lower ground, and on the other end to the motion and power transmission arm fixed to the intermediate vertical support element, • A motion and power transmission arm connected on one end to the intermediate vertical support element, and on other end to the motion and power transmission arm fixed to the lower ground, and • A motion and power center. • Lower platform, • Upper rail, • Lower rail as basic elements and • An upper step-piece, • An intermediate step-piece, • A step-piece fixed to the lower platform, • A connection element of the step-pieces connected on one end to the lower platform, and on the other end to an upper rail vertical support element, • A connection element for a step motion transmission feature, connected on one end to the upper rail vertical element, and on the other end to the intermediate vertical support element, • Step motion transmission features connected on one end to the connection element of the step motion transmission feature, and on the other end to the upper step-piece, the intermediate step-piece and the step-piece fixed to the lower platform, • A hinge connection located between the lower platform and the connection element of the step-pieces, enabling the angle between the lower platform and the connection element of the step-pieces to change, and the upper step-piece, the intermediate step-piece, the step-piece fixed to the lower platform and the lower platform to move parallel to the ground during the vertical elevation and descent of the disabled access system, • A motion and power transmission arm connected on one end to the lower ground, and on the other end to the motion and power transmission arm fixed to the intermediate vertical support element, • A motion and power transmission arm connected on one end to the intermediate vertical support element, and on other end to the motion and power transmission arm fixed to the lower ground, and • A motion and power center.