The invention provides a rainwater sensitive type humiture sensing device. The rainwater sensitive type humiture sensing device comprises a humiture sensor structural component which is fixed below a solar panel of online monitoring equipment, wherein a humiture sensor is installed at one side of the humiture sensor structural component, is toward the outer side of the device, is vertically arranged, and is externally covered by a rainwater flow guide mechanism which is in a vertically arranged cylindrical structure; a fixed element is installed at the other side of the humiture sensor structural component, and is in a rod-shaped structure, and a lead is arranged and is used for connecting the humiture sensor to a control unit and a power supply of the online monitoring equipment. The device provides input of humiture data with distinction degree for rainy days for a high-precision algorithm model, and can improve the calculation precision on rain date of optical sensing filth monitoring equipment.