Miniaturized HID ballast

The utility model discloses a miniaturized HID ballast which is characterized in that the miniaturized HID ballast comprises a housing and a driving module, and the driving module comprises a mainboard electric appliance element and a switch tube; wherein the shell comprises a bottom cover and a cover body, the cover body is provided with an opening facing the bottom cover, and the bottom cover covers the opening and is fixed on the cover body; wherein a cavity is formed in the shell, and at least two partition plates which are arranged up and down at intervals are arranged in the cavity; a heat dissipation layer used for placing a switch tube is formed between the partition plate closest to the bottom of the cavity and the adjacent partition plate, a mainboard layer used for placing mainboard electrical apparatus elements is formed between the partition plate closest to the top of the cavity and the cavity, and the area of the partition plate closest to the bottom of the cavity is larger than that of the par