With the increasing of engineering activities such as deep resource exploitation and deep space utilization, geotechnical engineering encounters more and more problems and challenges of rock mechanics in complex environments. It is urgent to develop rock mechanics testing research under high temperature and high pressure in-situ environment, and the rock mechanics test is required to have more accurate and more dimensional data measurement and collection capabilities. Therefore, this paper designs a sample preparation mold that meets the requirements of the measurement of the internal environmental parameters in the sample, and provids a pouring method for presetting buit-in sensors and signal transmission channels. Finally, several concrete samples with buit-in temperature sensors and signal transmission channels are prepared, and the buit-in sensors transmit signals normally through the wire, which indicates that the sample preparation mold meet the test requirements for the measurement of internal environmental parameters. The sample pouring mold is easy to operate, the preset sensor position is adjustable, and it can be used with a variety of buit-in sensors, which is operability, feasibility and applicability. Application of this device will be conducive to the development of more high-precision and multi-dimensional rock mechanics tests.