Server heat dissipation device and server

The invention relates to the field of servers, and provides a server heat dissipation device and a server. The device comprises a liquid cooling plate which comprises a plurality of flow channels, and the flow channels are used for transmitting cooling liquid; the flow channel structure is made of memory metal, the flow channel structure is fixed in the flow channel and used for variably blocking flowing of the cooling liquid, and the flow channel structure is used for responding to the situation that the temperature of the liquid cooling plate rises to the highest temperature value corresponding to deformation of the memory metal. And in response to the fact that the temperature of the liquid-cooling cold plate is reduced to the lowest temperature value corresponding to deformation of the memory metal, the liquid-cooling cold plate deforms to a first state in which blocking of flowing of cooling liquid in the runner is minimized, and in response to the fact that the temperature of the liquid-cooling cold pla