The utility model provides a platform and step on and take advantage of gangway ladder thereof should step on and take advantage of the gangway ladder to include: the autostairs, step on and take advantage of platform and linking bridge, the last lower extreme of autostairs all is provided with the rotation connecting portion, and the rotation connecting portion of its lower extreme take advantageof the platform to dismantle and rotationally to be connected with stepping on, and the side of a ship outside at platform can be dismantled and rotationally installed to the rotation connecting portion of its upper end, linking bridge one end takes advantage of the platform to be connected with stepping on, and other end detachably connects on platform's spud leg, stepping on and taking advantage of the platform can float on the surface of water, the lower extreme and the linking bridge that just can drive the autostairs go up and down along with water level of tide's change. The utility model discloses step on the autostairs and the linking bridge detachably that take advantage of the gangway ladder and be connected with platform, the platform shift or the bad weather condition under, can withdraw to the platform main deck on descending the autostairs, step on to take advantage of platform and linking bridge to demolish, avoid it to hinder operation or damaged. Simultaneously, stepon down and take advantage of the platform to go up and down along with tidal changes, be adapted to the different sea area of tidal range.