The utility model discloses an outdoor terminal box of a transformer station. The outdoor terminal box of the transformer station includes a box and a box door. The box is inside provided with a dehumidification circulation drier, a condenser, a heater and a temperature moisture monitor. The condenser includes a condensation chamber, a condensation sensor and a condensation controller. The dehumidification circulation drier is communicated with the condensation chamber. The heater and the condensation sensor are connected with the condensation controller separately. According to the utility model, moist air in the box is drawn into the condensation chamber for air-water separation, so that an effect of drying air in the box is realized.