The invention discloses a drilling pressure environment simulator and a use method thereof and belongs to the drilling technical field. The drilling pressure environment simulator includes a pitshaft, a sealing device arranged on the top of the pitshaft, an air incoming device which passes through the sealing device and extends into the pitshaft, a signal transfer device which passes through the sealing device and extends into the pitshaft, a support which is connected with the pitshaft, and a drainage device which is arranged at the bottom end of the pitshaft and passes through the pitshaft and the support sequentially. The drilling pressure environment simulator and the use method thereof of the invention are used for providing a drilling pressure environment and providing test conditions for the sealing performance tests of underground instruments or equipment.