The invention relates to the field of manufacturing of electronic products, in particular to a PCB (Printed Circuit Board) heat dissipation mounting seat. The mounting seat comprises a fixed seat, a heat conduction seat, a connector and a refrigerating board, wherein the connector and the refrigerating board are matched with a PCB heat dissipation lead-out pin; the connector is provided with a heat conduction pin; the heat conduction pin is connected to the heat conduction seat through the fixed plate; the heat conduction seat is embedded into the refrigerating board; side edges of a PCB are clamped on the fixed seat; the fixed seat is fixedly arranged on an outer frame; the outer frame is fixedly arranged on the refrigerating board; the refrigerating board comprises a upper supporting seat, a lower supporting seat and refrigerating fins; the refrigerating fins are slantwise, crosswise and fixedly arranged between the upper supporting seat and the lower supporting seat. The mounting seat has the beneficial effects that heat on the PCB is introduced into the refrigerating board for cooling, noise-free refrigeration can be realized, and the PCB is clamped through the outer frame and is prevented from shaking.