An oil-gas well completion temporary blocking liner tube used in under-balance well completion after under-balance well drilling belongs to the manufacturing technical field of a well completion pipe string used in overall process under-balance well drilling. The utility model, which makes use of the property that temporary blocking agent melts automatically under high temperature, designs the oil-gas well completion temporary blocking liner tube, wherein the liner tube comprises an upper joint and a lower joint; the tube body is provided with through screen apertures; the insides of the screen apertures are filled with temporary blocking agent. The utility model solves the problems that: according to the prior art, tail pipe perforation results in tail pipe deformation; moreover, a tail pipe is in nonstationary state inside a well, which brings trouble to follow-up work. The screen apertures of the temporary blocking liner tube are processed on the ground, and have the characteristics of convenient processing and no deformation; moreover, different adhesives can be selected to realize temporary blocking according to different well depth; when put in a well, the temporary blocking agent melts slowly as underground temperature reaches the preset value, thereby reaching the goal that the liner tube is changed to a temporary blocking liner tube with screen apertures.