An assembly structure of a hand wash liquid soap dispenser comprising: a main body casing; and a liquid storage bottle, wherein the assembly structure of the hand wash liquid soap dispenser further comprises an external snapping head snap-fitted on a bottle mouth of the liquid storage bottle, a plurality of protruded flexible snaps are provided at intervals on an outer periphery of an upper end of the external snapping head, a recessed groove engaged with the outer periphery of the external snapping head is provided on a bottom part of the main body casing, and a plurality of first snaps or snap grooves corresponding to the flexible snaps are provided on an inner wall of the recessed groove, a suction nozzle extending downward and protruding beyond the recessed groove is disposed on one side of the recessed groove, and a recessed hole for the suction nozzle to be inserted in and sealed is provided on the external snapping head, a through-hole communicating with an inside of the liquid storage bottle is provided on a bottom part of the recessed hole, a positioning recess is provided in a central part of a top end of the external snapping head, and a boss which extends downward and is to be inserted into the positioning recess is provided in a central part of the recessed groove, and the suction nozzle is disposed on one side of the boss and is protruded downward and beyond a lower end of the boss, the recessed hole is located on one side of a bottom part of the positioning recess, characterized in that two vertical guiding columns are provided on an inner wall of the positioning recess and respectively located at two sides of the recessed hole, one side of the boss is recessed and formed with guiding grooves which cooperate with the guiding columns, and the suction nozzle is located in a middle of the guiding grooves. a main body casing; and a liquid storage bottle, wherein the assembly structure of the hand wash liquid soap dispenser further comprises an external snapping head snap-fitted on a bottle mouth of the liquid storage bottle, a plurality of protruded flexible snaps are provided at intervals on an outer periphery of an upper end of the external snapping head, a recessed groove engaged with the outer periphery of the external snapping head is provided on a bottom part of the main body casing, and a plurality of first snaps or snap grooves corresponding to the flexible snaps are provided on an inner wall of the recessed groove, a suction nozzle extending downward and protruding beyond the recessed groove is disposed on one side of the recessed groove, and a recessed hole for the suction nozzle to be inserted in and sealed is provided on the external snapping head, a through-hole communicating with an inside of the liquid storage bottle is provided on a bottom part of the recessed hole, a positioning recess is provided in a central part of a top end of the external snapping head, and a boss which extends downward and is to be inserted into the positioning recess is provided in a central part of the recessed groove, and the suction nozzle is disposed on one side of the boss and is protruded downward and beyond a lower end of the boss, the recessed hole is located on one side of a bottom part of the positioning recess, characterized in that two vertical guiding columns are provided on an inner wall of the positioning recess and respectively located at two sides of the recessed hole, one side of the boss is recessed and formed with guiding grooves which cooperate with the guiding columns, and the suction nozzle is located in a middle of the guiding grooves.