The present invention relates to an automatic spraying disinfectant device, wherein left and right rotating angles and up and down rotating angles of a ventilating pipe can be adjusted by means of inputs before a disinfectant agent is sprayed, so that a sprayed range of the disinfectant agent can be freely adjusted corresponding to a disinfected range and the disinfectant agent can be automatically and rapidly sprayed. The automatic spraying disinfectant device of the present invention comprises: a ventilating pipe fixing unit which stands vertically to upwardly protrude in the rear of a body; and a ventilating pipe which is equipped at the top of the ventilating pipe fixing unit. The ventilating pipe fixing unit comprises: a rotary means which is equipped at the inner bottom of the body and has a vertical support protruding at the top thereof; a central hinge shaft which penetrates left and right through the top of the vertical support and the front bottom of the ventilating pipe; and an extendable cylinder which is connected between the rear bottom of the vertical support and the bottom of the ventilating pipe, so as to be operated by means of a cylinder operating unit; a sensing means which senses a left and right rotation angle and an up and down rotating angle of the ventilating pipe; and a control unit which selectively and manually operates the rotary means and the extendable cylinder, or selectively and automatically operates the rotary means and extendable cylinder according to a rotation angle set value of the sensing means by inputting the rotation angle set value of the sensing means.본 발명은 약제의 살포 전에 송풍관의 좌우 회전각도와 상하 회전각도를 입력에 의해 조정할 수 있도록 함으로써 방역 범위와 상응되게 약제의 살포 범위를 자유로이 조정하여 약제를 자동으로 신속하게 살포할 수 있도록 하는 약제의 자동살포 방역장비에 관한 것이다.본 발명의 약제의 자동살포 방역장비는, 본체의 후방에 상부로 돌출되게 수직으로 세워지는 송풍관 고정부와, 상기 송풍관 고정부의 상부에 구비되는 송풍관을 포함하는 방역장비에 있어서, 상기 송풍관 고정부는, 본체의 내부 하부에 구비되고 상부에는 수직 지지대가 돌출 구비되는 회전수단과, 상기 수직 지지대의 상부와 상기 송풍관의 전방 하부에 좌우 방향으로 관통되는 중심 힌지축과, 상기 수직 지지대의 후방 하부와 송풍관의