Provided is an intelligent detection and dirt discharge device for a transformer. The intelligent detection and dirt discharge device is installed on the lower portion of the transformer, water and dirt in a pollutant collection box of the transformer can be detected, and a reasonable detection means is provided for dirt discharge of the transformer. Staff judge whether sewage exists through an LED lamp of a humidity displayer of the intelligent detection and dirt discharge device and then carry out sewage discharge operation. Compared with the prior art, the intelligent detection and dirt discharge device has the advantages that the problems that the environment is polluted and the operation is complicated due to dirt discharge of the transformer can be effectively solved, and the work is simple and easy to implement. Combined with the reality, dirt discharge of the transformer can be judged and controlled accurately, the work quality can be quantified, dirt discharge of the transformer can be fully finished, and therefore stable operation of the transformer is guaranteed. The intelligent detection and dirt discharge device provides a reasonable detection means for dirt discharge of the transformer, improves the maintenance efficiency, and is safe, reliable and convenient and fast to use.