Rack-mounted electronic equipment and cabinet

The embodiment of the invention provides rack-mounted electronic equipment and a cabinet, and relates to the technical field of cases, the rack-mounted electronic equipment comprises an equipment shell, a mainboard and a liquid cooling heat dissipation assembly, the equipment shell has a first height, the first height is a standard height suitable for rack-mounted installation, the mainboard is installed in the equipment shell, a CPU assembly is arranged on the mainboard, the liquid cooling heat dissipation assembly is arranged on the equipment shell, and the liquid cooling heat dissipation assembly is arranged on the equipment shell. Wherein the liquid cooling heat dissipation assembly is installed above the CPU assembly and used for dissipating heat for the CPU assembly, and the sum of the height of the mainboard, the height of the CPU assembly and the height of the liquid cooling heat dissipation assembly is a second height; the expansion module is arranged above the liquid cooling heat dissipation assembl