An optical connector plug for outdoor waterproof onsite assembly, comprising: an optical connector that is coupled to a tip of an optical cable cut on a site, wherein the tip at one side of the optical cable is attached to an optical fiber of an optical cable of an assembly in a sealing manner, and a frame sheathing an outer side of the optical cable has one side end to which an outer peripheral edge of the assembly is coupled, has one or more slits which are cut from a middle to the other side end and are formed to be widened and narrowed in compliance with an outer diameter of the optical cable, and has a step on an outer peripheral edge at one side end to be held by an inner peripheral edge of a housing so as to withstand tensile strength applied to the outdoor optical cable, wherein the frame sheathes a sleeve and the optical cable and has one side end which is coupled to the assembly, wherein the sleeve sheathes a sealing part at which a cut tip at one side of the optical cable is attached to the other end of the optical fiber of the optical cable of the assembly, wherein a fixing unit is coupled to the other end of the frame to fix the frame to an outer peripheral edge of the optical cable, wherein the housing is coupled to an outer side of the frame, and a protective cap is coupled to one end of the housing through a rotation cap, wherein a protective tube is coupled to sheath the other end of the housing and the optical cable, and wherein a boot is coupled to an outer side of the protective tube and inhibits the optical cable from being excessively bent, wherein the housing has an O-ring groove on an outer peripheral edge at one side to which an O-ring is coupled, and the one side having the O-ring groove is coupled to an adaptor formed in an optical terminal box such that waterproofing is fulfilled with the O-ring in the O- ring groove. an optical connector that is coupled to a tip of an optical cable cut on a site, wherein the tip at one side of the optical cable is attached to an optical fiber of an optical cable of an assembly in a sealing manner, and a frame sheathing an outer side of the optical cable has one side end to which an outer peripheral edge of the assembly is coupled, has one or more slits which are cut from a middle to the other side end and are formed to be widened and narrowed in compliance with an outer diameter of the optical cable, and has a step on an outer peripheral edge at one side end to be held by an inner peripheral edge of a housing so as to withstand tensile strength applied to the outdoor optical cable, wherein the frame sheathes a sleeve and the optical cable and has one side end which is coupled to the assembly, wherein the sleeve sheathes a sealing part at which a cut tip at one side of the optical cable is attached to the other end of the optical fiber of the optical cable of the assembly, wherein a fixing unit is coupled to the other end of the frame to fix the frame to an outer peripheral edge of the optical cable, wherein the housing is coupled to an outer side of the frame, and a protective cap is coupled to one end of the housing through a rotation cap, wherein a protective tube is coupled to sheath the other end of the housing and the optical cable, and wherein a boot is coupled to an outer side of the protective tube and inhibits the optical cable from being excessively bent, wherein the housing has an O-ring groove on an outer peripheral edge at one side to which an O-ring is coupled, and the one side having the O-ring groove is coupled to an adaptor formed in an optical terminal box such that waterproofing is fulfilled with the O-ring in the O- ring groove.