The invention discloses a clutter discrimination method based on power transmission line hidden trouble discharging actual measurement current travelling wave on the basis of a conventional power transmission line hidden trouble discharging current travelling wave monitoring technology. The clutter discrimination method comprises steps that travelling wave sampling data of a continuous time period on a power transmission line is acquired, and is uniformly divided into N groups according to serial numbers; a sampling point current quadratic sum of every group of data is acquired, and the N groups of data are sequenced according to the quadratic sums; the sum S1 of the current quadratic sums of the first N/2 groups and the sum S2 of the current quadratic sums of the rear N/2 groups are respectively calculated according to the serial numbers of the groups, and therefore the ratio R=S1/S2 is acquired; and finally, a discrimination threshold Z is defined, and R is compared with Z, and when R is greater than Z, the current travelling waves acquired in the step1 are hidden trouble current traveling waves, and when R is smaller than Z, the current travelling waves acquired in the step 1 are normal harmonic waveforms. The hidden trouble travelling waves of the power transmission line current waveforms are discriminated, and the active protection level of the overhead line is greatly improved.