The invention relates to a line inlet structure for an alternating current filter of a converter station. The line inlet structure comprises a first alternating current filter, a second alternating current filter, a third alternating current filter, a fourth alternating current filter, a fifth alternating current filter, a sixth alternating current filter, first GIS equipment and second GIS equipment, wherein the first alternating current filter, the second alternating current filter and the third alternating current filter form an L-shaped structure together T; the fourth alternating currentfilter, the fifth alternating current filter and the sixth alternating current filter form an L-shaped structure together; the first GIS equipment is electrically connected to the first alternating current filter, the second alternating current filter and the third alternating current filter respectively; and the second GIS equipment is electrically connected to the fourth alternating current filter, the fifth alternating current filter and the sixth alternating current filter respectively. According to the line inlet structure, an incoming line of the alternating current filter can span the incoming line of the filter from the end of an alternating current filter field, so that the occupation of the area of other functional areas of the convertor station is avoided, and the line inlet structure has the advantages that a GIS branch bus is saved, the transverse floor area of the convertor station is reduced and the like.