The invention discloses a folding type sinking seat structure which has simple structure and can be retracted horizontally while meeting the sitting requirement so as to extend the storage room of a vehicle body maximally, solving the technical problems of complex device structure, small storage room after retracting, insufficient utilization of the storage room and the like in the prior art. Thefolding type sinking seat structure comprises a seat cushion and a backrest rotatably connected on the seat cushion, a front supporting leg and a rear supporting leg are symmetrically arranged at twosides of the seat cushion, one end of the front supporting leg is movably connected with a bottom plate, the other end of the front supporting leg is rotatably connected with a pull rod and is rotatably connected with the backrest by the pull rod, one end of the rear supporting leg is movably connected with the bottom plate, and the other end of the rear supporting leg is rotatably connected witha rocker arm and is rotatably connected with the backrest by the rocker arm.