The invention provides an energy converter transformer box, which comprises a box body. The box body is formed by connecting a bottom plate, a top plate and four side plates. The four corners of the box body are respectively provided with a reinforcing assembly. The reinforcing assembly comprises a connecting plate, a press plate, an outer angle plate and an inner angle plate. The connecting plate is in L shape; the two edges of the connecting plate are connected to the two end surfaces of each corner of the box body respectively; the two ends of the press plate are connected to the outer sides of the two end surfaces respectively; the outer angle plate is an L-shaped plate having an arc angle in the middle; the two ends of the outer angle plate are connected to the outer side surfaces of each corner of the box body respectively; the outer angle plate wraps the press plate; the inner angle plate is in L shape, and the two edges of the inner angle plate are connected to the inner side surfaces of each corner of the box body respectively; the connecting corners of the four side plates of the box body are respectively provided with a window plate capable of being opened outwards; seal strips are arranged between the window plates; and the inner side of each window plate is provided with a filter screen. Through the mode above, the structural strength of the box body can be enhanced.