Transformer substation for preventing small animals from entering

The invention provides a transformer substation for preventing small animals from entering. The transformer substation comprises a transformer box provided with a box door, wherein a heat dissipationopening is formed in one side of the transformer box, a accommodating groove is formed in one side in the heat dissipation opening, a sealing plate moving along the accommodating groove is arranged inthe accommodating groove, and a first rack is arranged on one side of the sealing plate; a connecting frame moving along the heat dissipation opening is installed in the heat dissipation opening through a connecting rod assembly, and a second rack is horizontally arranged on the outer side of the connecting frame; a driving wheel and a first gear which are coaxial are arranged on one side in theheat dissipation opening, and the driving wheel is meshed and matched with the second rack; a second gear meshed with the first gear is arranged on the other side in the heat dissipation opening, a driven wheel coaxial with the