A mechanical expanded connection lubricant adjustment method includes the steps that firstly, a lubricant selection range is determined, and oily grease is excluded; then, substitute media convenient and easy to remove and easy to obtain are searched for; afterwards, several different substitute media are tested one by one; and finally, domestic hyperconcentrated dishwashing liquid is selected as a substitute lubrication medium. The mechanical expanded connection lubricant adjustment method has the beneficial effects that practice shows that the lubrication effect is good, the substitute lubrication medium is removed conveniently, rapidly and thoroughly after expanded connection is completed, and welding quality can be guaranteed.