The water and gas dual-purpose multi-function drilling rig can use mud drilling or air compressor for drilling. The drilling method of the drilling rig adopts advanced hydraulic cylinder feeding design, stepless speed regulation and lifting, and automatic drilling technology can be realized when drilling. It automatically pressurizes the hole under the weight of the drill pipe. The drilling speed can be adjusted according to different geological conditions. Equipped with large lifting force hydraulic main hoist, stepless speed regulation hoisting, which can realize fast rope release. When lifting heavy objects, move slowly so as not to damage the rig turntable and wellhead plate during the lifting process. When lowering a single drill pipe, operating the quick release handle can achieve the same rapid lowering as a mechanical crane. The hydraulic tool hoist has the characteristics of large lifting force and fast lifting speed, which is convenient for the loading and transportation of tools, drill pipes, accessories, etc. It can also slide up and down with the help of ground anchors during drilling, so it is very convenient to load and unload the drill pipe The rig is equipped with 4 hydraulic outriggers and 2 mechanical outriggers. The piston rod of each hydraulic outrigger cylinder is threaded and fitted with a lock nut. After the rig is leveled, the cylinder can be locked with the lock nut. This way, even if the cylinder blows out, the chassis doesn't become unstable. The drilling rig is equipped with an auxiliary rod unloading cylinder, which is used to push the ratchet teeth of the turntable, remove the first thread of the drill rod joint, and then reverse the unloading rod to the turntable to prevent the impact force from damaging the rig gearbox.