The utility model discloses a novel high-frequency high-voltage transformer comprising a transformer body, a shell (6), a cooling fan (4) and a bottom plate (5). The shell is a hollow square-column-shaped shell composed of six side plates, the transformer body comprises a cylindrical iron core (1) and six groups of coils, and the six groups of coils are sequentially wound on the iron core along the axis direction of the iron core in a cascade manner. A group of binding posts (7) are arranged on each of two opposite sides of the shell, and each group of binding posts includes twelve binding posts arranged in two columns. The binding posts are connected with one another in a short circuit manner through connecting pieces or wires. Eighteen radiating holes (10) are formed in the bottom plate. Each side plate for forming the shell is composed of a frame (12) and multiple transverse louver blades (11), and the louver blades are mounted on each frame in a manner of inclining outwards and downwards. The novel high-frequency high-voltage transformer is good in heat emission effect and has good flexibility in use.