It is an object of the present invention to provide a bi-directional disinfection system capable of irradiating ultraviolet rays from both sides of an apparatus water discharge pipe through which water passes, into the inside of the apparatus water discharge pipe. To this end, the bi-directional disinfection system according to the present invention maximizes the output of the UV LEDs by concentrating the light using the UV LEDs 330 and 430 and the optical lenses 340 and 440 and irradiating light in both directions , And a sterilizing system for sterilizing the water passing through the apparatus drain pipe (200). The system includes a drain pipe (200) having an inside passage therethrough and a drain pipe A second light source unit 400 mounted on the other side of the instrument discharge pipe 200 so as to face the first light source unit 300 with the tool discharge pipe 200 interposed therebetween and irradiating ultraviolet rays； And a control unit 100 for controlling the first light source unit 300 and the second light source unit 400. The apparatus drainage pipe 200 includes a main body 210 through which the inside of the main body drain pipe 200 passes, 200 and the through-1 connection part 220 is connected to the main body 210 on the opposite side of the first connection part 220 with the main body 210 interposed therebetween and penetrates through the main body 210 and the first connection part 220 A first connection cock 230 connecting the external drain pipe and the first connection unit 220 and a second connection cock 250 connecting the external drain pipe and the second connection unit 240, And the first light source unit 300 includes a first substrate 320, a plurality of first UV LEDs 330 mounted on the first substrate 320, first UV LEDs 330, A first optical quartz lens 340 disposed between the first UV LEDs 330 and 200, a first heat sink 310 emitting heat generated from the first UV LEDs 330 to the outside, a first optical quartz lens 340, A first wat
