Moon large-depth in-situ while-drilling and protection coring device

The invention relates to the technical field of rock drilling, and particularly discloses a large-depth in-situ while-drilling and protection coring device for the moon. Comprising a drill rod assembly provided with a mounting cavity, a drill bit connected with the drill rod assembly, a shell in sliding fit with the drill rod assembly, a transmission mechanism mounted in the shell, a rock core barrel arranged in the mounting cavity, a film forming mechanism arranged in the rock core barrel and a follow-up protection liquid self-sealing storage mechanism arranged between the film forming mechanism and the transmission mechanism. The drill rod assembly is provided with a follow-up protection liquid flow channel communicated with the follow-up protection liquid self-sealing storage mechanism. In the using process, positioning can be conducted, a drill bit can be effectively cooled and protected, the surface of a rock core is covered with a film, the whole rock core is effectively protected, and therefore the roc