The invention provides a technique string for offshore oil production. The technique string comprises a string assembly and an electric submersible pump assembly which is disposed in the string assembly. The string assembly comprises an oil pipe sleeved inside a casing, and a non-well-killing switch is arranged at the front end of the oil pipe; the electric submersible pump assembly comprises an electric submersible pump and a non-well-killing-switch operating rod which is disposed at the front end of the electric submersible pump, the electric submersible pump is disposed inside the oil pump, and the non-well-killing-switch operating rod is located above the non-well-killing switch. When pump inspection work of an oil well is needed, the electric submersible pump can be released without well killing, a work platform is omitted, working hours are shortened, and oil pollution can be reduced.