The invention provides heat dissipation equipment and an outdoor display cabinet of an outdoor display. The heat dissipation equipment comprises a heat exchange cabinet and a crossed radiating fins, wherein the heat exchange cabinet comprises a front panel, a side face shell, a back face shell, a top cover and a bottom cover; the display and the crossed radiating fins are built in the heat exchange cabinet; an rising air duct is enclosed by the display, the front panel and the side face shell; a declining air duct is enclosed by the display, the back face shell and the side face shell; the rising air duct is communicated with the top of the declining air duct; the bottom cover is provided with an air inlet and an air outlet; the air inlet is communicated with the rising air duct; the air outlet is communicated with the declining air duct; the crossed radiating fins are arranged on the back face shell of the heat exchange cabinet and comprise at least two heat dissipation layers respectively; each heat dissipation layer consists of a plurality of metal strips which are connected along a horizontal or vertical direction side by side; and the arrangement directions of the metal strips of the adjacent heat dissipation layers are mutually vertical. Through the heat dissipation equipment, the heat around the display can be dissipated immediately, so that normal ambient temperature of the display is reasonably ensured.