A method of controlling path penetration of a slick line thickened oil pipe comprises the following steps that (1) a thickened oil pipe main pipe is produced; (2) the two ends of the oil pipe main pipe are thickened, and the value of the difference between the largest wall thickness and the smallest wall thickness is smaller than or equal to 0.8mm; (3) after the thickening operation is accomplished, a path penetration bar is used for conducting path penetration treatment on the portions, with the length of 100mm, of the thickened ends; (4) the two ends of the thickened oil pipe which meets theexamination requirements of the step (2) and the step (3) are subjected to thread turning operation; (5) after the thread turning operation is accomplished, threads are examined according to the APISPEC 5B standard; (6) the thickness of the wall between a ring gauge shoulder and the inner wall of the oil pipe which is qualified in the thread examination process is measured; (7) a coupling is connected to the factory end of the thickened oil pipe in a screwed mode; and (8) total-length water pressure path penetration is conducted on the oil pipe with the coupling. By the adoption of the method, the path penetration which exists after oil pipes on the site of an oil field are connected in a screwed and buckled mode to form a pipe column, and the pipe column is fed into an oil-gas well canbe guaranteed, then the slick line operation can be normally conducted, and therefore the operation requirements of oil-gas fields and especially offshore oil-gas fields for the links of well completion, well repair and testing are met.