The invention provides a memory module. A pressing tongue is rotatably mounted on a fixed block through a reset spring, the reset spring provides a first driving force for rotation of the pressing tongue, the rotating block is rotatably mounted on a slider through a torsion spring, the torsion spring provides a second driving force for rotation of the rotating block, the slider is slidably mountedon a guide rail, a locking block is inserted into a locking hole when the rotating block projects forwards under the action of the second driving force, the upper retaining surface is separated froma first retaining point, the locking block is separated from the locking hole when the pressing tongue presses the rotating block downwards under the action of the first driving force to overcome thesecond driving force to force the rotating block to raise backwards, the upper retaining surface contact with the first retaining point. The invention further provides a seat installation structure with an easily inserted module. The seat installation structure comprises the memory module. According to the memory module and the seat installation structure, the rotatable pressing tongue is matchedwith the rotating block, so that is locking and unlocking of the slider on a guide rail are achieved, the occupy space in a sliding rail is small, and use universality of the module is enhanced.