X-ray detector cooling system and X-ray imaging system

A cooling system for an X-ray detector, comprising:

• a cooling pipeline positioned on an X-ray detector;
• and
• a coolant transfer pipeline positioned at least partially in a support device of the X-ray detector and connected with the cooling pipeline to form a circulation loop, the circulation loop being provided with a circulating coolant therein;
• wherein the support device comprises a C-shaped arm, and wherein a first section of the coolant transfer pipeline is embedded into the C-shaped arm;
• and
• a coolant replenishing device positioned in the circulation loop, wherein the coolant replenishing device comprises a first chamber and a second chamber, the first chamber is connected to the coolant transfer pipeline, and the second chamber is connected to the first chamber via a connection pipe, and wherein when the coolant replenishing device is tilted at a specific angle, the first chamber is full of the coolant, and the liquid level of the coolant in the second chamber is higher than the position of the connection pipe.