The utility model discloses a bird excrement propelling device. The bird excrement propelling device comprises a bird excrement holding container and a sealed container; a cavity is formed inside the bird excrement holding container; a feeding device is arranged on the bird excrement holding container and communicated with the cavity by use of a second valve; a discharge hole communicated with the cavity is formed in the lower end of the bird excrement holding container; a nozzle is arranged at the discharge hole; a plugging device is arranged at the outlet of the nozzle; a one-way valve is arranged on the sealed container; the cavity of the bird excrement holding container is communicated with the sealed container by use of a communication pipeline with a first valve. The bird excrement propelling device is capable of realizing experimental simulation of a bird excrement channel formed between a cross arm and a conductor when birds defecate on the cross arm in such a manner that a bird excrement simulation liquid is held in the bird excrement holding container, compressed air is stored in the sealed container and the bird excrement simulation liquid is ejected from the nozzle by use of the compressed air entering into the bird excrement holding container.