The invention discloses a rat catching device which comprises a plastic bucket, wherein a bucket cover is arranged above the plastic bucket, two holes are formed in the bucket cover, an iron wire is arranged below the bucket, a hook is formed in the lower part of the iron wire, a bait is arranged on the hook, the iron wire is connected with a power switch, the power switch is connected with a bubble, a motor, a high pressure airbag and an electric stove, the high pressure airbag is connected with a pressure alarm through a pressure detecting device, and the high pressure airbag, the bubble, the pressure detecting device and the pressure alarm are all arranged outside the plastic bucket. The device provided by the invention has a simple structure, is convenient to use, low in cost, good in rat catching effect, and can be widely applied to families, restaurants, districts, schools and the like.