Air conditioner condensation system of underground building and installation method

The invention discloses an air conditioner condensation system of an underground building and an installation method. The air conditioner condensation system comprises inlet exhaust pipelines which are installed in a plurality of preset areas, needing to be exhausted, in an underground building; the exhaust fan is mounted in the exhaust machine room, and an air inlet of the exhaust fan is communicated with the inlet exhaust pipeline; the partition plate support is arranged in the exhaust shaft, and a condenser mounting opening is formed in the partition plate support; wherein the exhaust shaft is positioned on one side of the exhaust machine room and is communicated with an exhaust outlet of the exhaust fan through the outlet exhaust pipeline; the condenser comprises a shell and a refrigerant pipe; the shell is arranged at the condenser installation opening and provided with an exhaust channel. The refrigerant pipe is arranged in the shell, and the two ends of the refrigerant pipe are connected with an air pi