The utility model belongs to the technical field of memory banks, and discloses a liquid cooling heat dissipation device for a
DIMM, which comprises a heat conduction
assembly, a liquid cooling
assembly and a rotating
assembly, and is characterized in that the heat conduction assembly comprises a heat conduction plate and a
heat pipe, and the heat conduction plate is arranged between the
heat pipe and the
DIMM; the liquid cooling assembly comprises a first water collector, a second water collector and a circulating
pipe, two ends of the circulating
pipe are respectively communicated with the first water collector and the second water collector, one end of the
heat pipe is fixedly connected with one of the first water collector and the second water collector, and the other end of the heat
pipe is selectively connected with the other one of the first water collector and the second water collector; the rotating assembly is connected with the first water collector or the second water collector. Thus, the
heat conducting plate and the
DIMM are assembled, then the DIMM is inserted into the memory slot, the
heat conducting plate can well transfer heat of the DIMM by adjusting connection between the
heat conducting plate and the DIMM, the heat pipe can rotate in the direction close to or away from the heat conducting plate under the action of the rotating assembly, and enough space is conveniently reserved around the DIMM to assemble and disassemble the DIMM.