The invention discloses a three-dimensional temperature equalizing device. The three-dimensional temperature equalizing device comprises a temperature equalizing base plate and at least one temperature equalizing vertical plate corresponding to joints; first chambers are formed in the temperature equalizing base plate, first capillary structures are arranged in the first chambers, and at least onejoint communicating with the first chambers are formed in the outer surface of the temperature equalizing base plate; each temperature equalizing vertical plate comprises a sleeve nozzle, the sleevenozzles sleeve the joints to enable the temperature equalizing vertical plates to be vertically arranged on the temperature equalizing base plate, second capillary structures are arranged in the sleeve nozzles, and the second capillary structures extend and protrude out of the sleeve nozzles to enter the first chambers and are connected to the first capillary structures. According to the three-dimensional temperature equalizing device, the first capillary structures are connected to the second capillary structures, so that a working fluid can smoothly flow between vapor chambers.