The invention relates to the technical field of underground excavation engineering, in particular to a small pipe jacking machine and an underground pipeline laying device. The small pipe jacking machine comprises a sliding rail, a sliding plate arranged on the sliding rail and a main machine connected to the sliding plate; the sliding plate can slide freely along the sliding rail; a sliding rod is arranged on the sliding plate, and a handle is arranged on the sliding rod; the sliding rod has the length, the sliding rod comprises a first end and a second end along the length direction of the sliding rod, and the first end and the second end correspond mutually; and the first end is connected with the sliding plate, the second end is connected with the handle, and the length direction of the sliding rod is perpendicular to the sliding plate. The underground pipeline laying device comprises the small pipe jacking machine. The small pipe jacking machine and the underground pipeline layingdevice solves the technical problems that the earth volume of excavation of a foundation pit is large, and the construction workload is increased due to the fact that an operator stands in the foundation pit and operates a rotary handle in a comfortable posture in the prior art.