Tiny insect detection device

A tiny insect detection device includes a detector, a controller, and a monitoring device. The detector has a first conductive member, a second conductive member, and an insulation member therebetween. The controller is coupled with the first and the second conductive members, and delivers a direct current for charging the detector. When a tiny insect contacts the charged detector, the detector generates a contact reaction, and the controller transforms the contact reaction into a contact signal. The monitoring device receives the contact signal and compares it with a threshold value for analysis, so as to identify the insect category features. The monitoring device integrates the signal variations corresponding to time and the insect category features into a sensing data to be displayed. Thus, through a contact detection method, the present invention obtains an accurate tiny insect monitoring result.