Retractable well drilling machine

The invention relates to a retractable well drilling machine. The purpose is to solve the problems that in the prior art, pipeline replacement consumes much time and is not safe, and a whole machine is difficult to transport. The retractable well drilling machine comprises a base, a lifting support, a drilling stand and a fixing support installed on the base. The lifting support is in sliding connection with the fixing support, and the drilling stand is installed on the lifting support. A well drilling motor, a well drilling motor speed reducer and a faucet are sequentially installed on the drilling stand from top to bottom. A sliding rail is arranged on the fixing support, and the well drilling machine further comprises a power mechanism driving the drilling stand and/or the lifting support to move along the sliding rail. The retractable well drilling machine has the advantages that the base comprises a fixed part and a sliding part and can drive a drilling rod to be lengthened, and well drilling efficiency is improved. Rapid disassembly of the drilling stand is achieved, transferring carrying is facilitated, and maintaining time is easily shortened. Replacing of a pipeline used for well drilling can be automatically completed.