The invention discloses an intelligent line joint conduction detection system and method. The system comprises an A/D conversion unit, an I/V conversion unit, a loop measurement unit, a single-chip microcomputer unit and a range switching unit, wherein the loop measurement unit is connected with leads at two sides of a circuit joint to be detected, and the output end of the loop measurement unit is connected with the input end of the A/D conversion unit through the I/V conversion unit; the input end of the single-chip microcomputer unit is connected with the output end of the A/D conversion unit; the input end of the range switching unit is connected with the output end of the single-chip microcomputer unit, and the output end of the range switching unit is connected with a control end ofthe loop detection unit so as to adjust the frequency of output signals of the loop detection unit. The intelligent line joint conduction detection system can effectively confirm the line joint stateof a power transmission line so as to effectively avoid the occurrence of safety accidents.