Rocket engine cooling and stealth design device

The invention relates to a rocket engine cooling and stealth design device. The rocket engine cooling and stealth design device comprises an engine shell, a combustion chamber, a tail spray pipe, a self-pressurization liquid nitrogen tank, a concentric-square-shaped pipeline and a control component; the combustion chamber is erected in the engine shell, the tail spray pipe is fixedly connected with the outlet end of the combustion chamber, and the self-pressurization liquid nitrogen tank is fixedly connected with the top of the engine shell; one end of the concentric-square-shaped pipeline isin communication with the self-pressurization liquid nitrogen tank, and the other end of the concentric-square-shaped pipeline is in communication with the tail spray pipe; and the control component is connected between the concentric-square-shaped pipeline and the self-pressurization liquid nitrogen tank, wherein the concentric-square-shaped pipeline is spirally distributed on the outer side of the engine shell, the part