The invention discloses an outdoor box-type transformer device, which can circulate airflow in a large area of the box body, the box body structure is more reasonable, and is more conducive to the promotion of heat dissipation effect. The invention comprises a box body and a transformer body arranged in the box body; a lid is arranged on that top of the box body; the box body is installed on the base, and the box body comprises a left side and a right side and two front and rear end faces; an end face is provided with a door plate, an air inlet is arranged at a position close to the bottom ofat least one end face, and an air inlet assembly is installed on the air inlet; the two sides are symmetrically arranged and each side comprises an upper side plate and a lower side plate, and the included angle between the upper side plate and the lower side plate is an obtuse angle; the top plate of the box body is provided with an air exhaust outlet, and the air exhaust outlet is provided withan air exhaust component; the exhaust assembly passes upward through the box cover; the case cover includes a horizontal portion for covering the top plate of the case and an inclined portion arrangedon both sides of the horizontal portion for covering the upper side plates on both sides of the case. The distance between the lid and the box is L, and L is greater than 0.