Reticle adjusting structure, multi-mode sighting device, and reticle adjusting method thereof

A reticle adjusting structure, comprising a reticle plate, a beam combination lens, and a relay lens assembly arranged in sequence along a visible-light optical axis and a display module arranged outside of the visible-light optical axis;

• wherein the beam combination lens comprises a first light entry surface and a second light entry surface that are opposite to each other and respectively face a visible light signal incidence direction and the display module;
• wherein the relay lens assembly comprises a magnification variation lens set and a compensation lens set;
• a visible light signal of a target field of view passes through the reticle plate to get incident on the first light entry surface of the beam combination lens, and is then transmitted to the relay lens assembly;
• a message displayed on the display module transmits, in the form of an optical signal, onto the second light entry surface of the beam combination lens, and is then reflected to the relay lens assembly;
• and
• the reticle plate, the beam combination lens, the relay lens assembly, and the display module are interconnected together to form an integrated lens set that is collectively movable together, in order to realize collective adjustment during a reticle adjusting course.