The present invention relates to an unmanned pest controller having a new structure capable of preventing an injection unit coupled to a guide rail from being held by foreign matters attached to the guide rail and immovable in forward and backward directions. According to the present invention, the unmanned pest controller is configured such that a control means (60) is connected to a rotation sensing means (25) and a first solenoid valve (73) to drive a pump (33) of a liquid chemical supply means (30) and a driving motor (53) of a driving means (50), so that when liquid chemical is configured to be supplied to an injection nozzle (24) through a water supply pipe (31) while the injection unit (20) moves in forward and backward direction, the control means (60) receives a signal of the rotation sensing means (25) to sense whether the injection unit (20) moves in forward and backward directions. When it is sensed that injection unit (20) is not moved in forward and backward directions while being held by foreign matters attached to an upper surface of the guide rail (10), the control means (60) opens the first solenoid valve (73), and accordingly, the liquid chemical supplied through the water supply pipe (31) is injected to the guide rail (10) through an auxiliary injection nozzle (71), and thus, the foreign matters attached to the upper surface of the guide rail (10) can be washed. Therefore, it is possible to prevent the injection unit (20) from being held and immovable by the foreign matters attached to the upper surface of the guide rail (10).본 발명은 가이드레일에 결합된 분사유닛이 가이드레일에 부착된 이물질에 걸려 전후진되지 못하게 되는 것을 방지할 수 있도록 된 새로운 구조의 무인방제기에 관한 것이다.본 발명에 따른 무인방제기는 상기 제어수단(60)이 상기 회전감지수단(25)과 상기 제1 솔레노이드밸브(73)에 연결되어, 상기 약액공급수단(30)의 펌프(33)와 상기 구동수단(50)의 구동모터(53)를 구동시켜 상기 분사유닛(20)이 전후진되면서 상기 급수관(31)을 통해 상기 분사노즐(24)로 약액이 공급되도록 한 상태에서 상기 회전감지수단(25)의 신호를 수신하여 상기 분사유닛(20)이 전후진되는지를 감지하고, 상기 분사유닛(20)이 가이드레일(10)의 상면에 부착된 이물질에 걸려 전후진되지 못하는 것이 감지되면, 상기 제1 솔레노이드밸브(73)를 개방하여 상기 급수관(31)을 통해
