The disclosure discloses a toilet seat assembly installation structure convenient for disassembly and assembly, which comprises fixing members fixedly installed on a toilet seat; a hinge base including hinge portions and installation portions, the hinge portions hinging with a cover plate, the installation portions engaging with the fixing members; and snap-in connection members configured to detachably and position-limitedly installed on the installation portions along a vertical direction so that the snap-in connection members are fixedly engaged with the fixing members, or to detachably and position-limitedly installed on the fixing members along the vertical direction so that the snap-in connection members are fixedly engaged with the installation portions. The toilet seat assembly installation structure is easy to operate, can be dissembled and assembled by inserting/removing the hinge base into/from the fixing members, and is stable and reliable.