The invention relates to an iso-focus control system for emission laser light and target detection light, including a beam iso-focus detection unit, a control unit, a target light defocusing correction unit and an emission laser light defocusing correction unit; wherein the beam iso-focus detection unit is configured to detect the defocusing amount of the target detection light and the defocusing amount of the emission laser light; the control unit is configured to control the target light defocusing correction unit according to the defocusing amount of the target detection light, and control the emission laser light defocusing correction unit according to the defocusing amount of the emission laser light so that the difference between the defocusing amounts of the corrected target detection light and the corrected emission laser light is within a set range.
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