The invention discloses a hand washing sink and an application method thereof. The hand washing sink comprises a water tank and a placement table which is arranged in the water tank and protrudes upwards; a spraying mechanism, a flow guide mechanism and a switch assembly are arranged in the water tank; the spraying mechanism comprises a double-head downward spraying assembly, an inclined sprayingassembly and an upward spraying assembly; the double-head downward spraying assembly comprises a converter and a rotary connector; the converter comprises a V-shaped fork, a spherical spray head and acylindrical pipe spray head, wherein the spherical spray head is connected to a first end of the V-shaped fork, and the cylindrical pipe spray head is connected to a second end of the V-shaped fork;a third end of the V-shaped fork is connected to the rotary connector, and the rotary connector is a rotary switching valve, so that a third end of the V-shaped fork is switched to be communicated with the first end of the V-shaped fork or the third end of the V-shaped fork is switched to be communicated with the second end of the V-shaped fork; the spherical spray head is in a spherical shape; and tiny spray holes are uniformly distributed in the spherical spray head. According to the hand washing sink and the application method thereof, objects can be cleaned in an all-dimensional manner, splashing caused by too large water flow speed can be effectively relieved, and residues can be effectively immobilized on the inner wall of the water tank.