The present invention allows the day, night, and day and night operation modes to be selected in accordance with the purpose of use, allows the operation to be performed differently according to each selection mode, and includes a lock / unlock function to prevent theft, The present invention relates to a harmful assistant water repellent device capable of preventing an operation from being changed, comprising: a body formed of a circular column or a polygonal column； A plurality of light emitting units arranged at regular intervals along the outer peripheral surface of the upper side and the lower side of the body； A speaker for outputting an erasure sound； A photovoltaic power generation unit installed at an upper side of the body and inclined at a predetermined angle to collect solar energy and convert it into electrical energy； An illuminance detecting unit for sensing a brightness of the surroundings； A signal input unit for allowing a user to input a signal such as power on / off, volume adjustment, mode setting, lock / unlock function setting, password input, etc.； A power supply unit provided with a rechargeable battery for charging electrical energy of the photovoltaic power generation unit or charged by a commercial power supply to supply power to each part； A display unit for displaying a state of charge of the rechargeable battery； And controlling the output of the plurality of light emitting units and the output of the speaker to operate in a day mode, a night mode, and an all day mode according to a signal input through the signal input unit, And a controller for inputting a password at the time of the setting of the day mode, the night mode and the all day mode, the setting of the lock / unlock, and the change / registration of the password.본 고안은 사용 목적에 맞추어 주간, 야간 및 주야간 동작 모드를 선택할 수 있도록 하고, 각 선택모드에 따라 동작을 달리하여 효율적으로 동작되도록 하고, 잠금/해제 기능을 부가하여 도난 방지 및 타인의 의해 모드 및 동작을 변경할 수 없도록 할 수 있는 유해 조수 퇴치 장치에 관한 것으로, 원형 기둥 또는 다각형 기둥으로 형성되는 몸체； 상기 몸체의 상부측 및 하부측의 외주면을
