A weft knitting machine capable of changing yarn positions, and capable of feeding a facing yarn and a bottom yarn during knitting, the weft knitting machine comprising: a plurality of sinkers respectively comprising a belly, a nose connected with the belly, and a throat between the belly and the nose, wherein each of the plurality of sinkers is guided to perform a linear displacement movement, so as to position the facing yarn above the nose and the bottom yarn in the throat during a process of the linear displacement movement; and a plurality of needles respectively arranged adjacent to one of the plurality of sinkers, a motion direction of plurality of needles perpendicular to a direction of the linear displacement movement, each of the plurality of needles including a hook and a latch for performing a closing action relative to the hook, characterised in that in a first needle retracting track, each of the plurality of needles controls the latch performing a closing action at a first latch closing time point; and in a second needle retracting track, each of the plurality of needles controls the latch performing a closing action at a second latch closing time point before the first latch closing time point; wherein each of the plurality of needles in the first needle retracting track can knit a standard plating without changing positions of the facing yarn and the bottom yarn in the hook; and wherein each of the plurality of needles in the second needle retracting track knits an interchanged plating with changing the positions of the facing yarn and the bottom yarn in the hook, wherein in the second needle retracting track, the latch is capable to drive the bottom yarn to make the bottom yarn pushed by the nose of one of the plurality of sinkers when one of the plurality of sinkers adjacent to each of the plurality of needles does not restrict positions of the facing yarn and the bottom yarn. a plurality of sinkers respectively comprising a belly, a nose connected with the belly, and a throat between the belly and the nose, wherein each of the plurality of sinkers is guided to perform a linear displacement movement, so as to position the facing yarn above the nose and the bottom yarn in the throat during a process of the linear displacement movement; and a plurality of needles respectively arranged adjacent to one of the plurality of sinkers, a motion direction of plurality of needles perpendicular to a direction of the linear displacement movement, each of the plurality of needles including a hook and a latch for performing a closing action relative to the hook, characterised in that in a first needle retracting track, each of the plurality of needles controls the latch performing a closing action at a first latch closing time point; and in a second needle retracting track, each of the plurality of needles controls the latch performing a closing action at a second latch closing time point before the first latch closing time point; wherein each of the plurality of needles in the first needle retracting track can knit a standard plating without changing positions of the facing yarn and the bottom yarn in the hook; and wherein each of the plurality of needles in the second needle retracting track knits an interchanged plating with changing the positions of the facing yarn and the bottom yarn in the hook, wherein in the second needle retracting track, the latch is capable to drive the bottom yarn to make the bottom yarn pushed by the nose of one of the plurality of sinkers when one of the plurality of sinkers adjacent to each of the plurality of needles does not restrict positions of the facing yarn and the bottom yarn.