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This invention discloses a method and device for rapid synchronous phasor sensing of single-phase current in power system transmission and distribution lines, belonging to the field of current measurement technology. The method includes: constructing a current sensing probe using TMR chips and measuring the spacing between the chips; placing a printed circuit board carrying the current sensing probe at the line under test and acquiring the instantaneous output voltage values ​​of each TMR chip; calculating the phase of the current phasor under test based on the instantaneous output voltage values ​​of the TMR chips; and calculating the amplitude of the current phasor under test based on the instantaneous output voltage values ​​of the TMR chips and the spacing between the chips. The method and device for rapid synchronous phasor sensing of single-phase current in power system transmission and distribution lines described in this invention can solve the problems of poor installation convenience and complex calculation processes in existing current phasor sensing methods.