A grape planting trellis comprises a plurality of support pillars symmetrically arranged on two sides and two crossbeams fixed to the tops of the support pillars, wherein a sliding groove with a plurality of sliders arranged therein is formed in each crossbeam; an arc-shaped top beam is fixed between each slider and the corresponding slider on the other side; a plastic film insulating layer is spread on the arc-shaped top beams; intermediate cross rods are arranged on the arc-shaped top beams; a folding rack is arranged between every two cross rods; a through hole is formed in each intermediate cross rod; a winding pull rope is fixed at the through hole of the cross rod on the rightmost arc-shaped top beam, sequentially penetrates the through holes in the cross rods of the arc-shaped top beams from right to left and bypasses a winding idler pulley to be connected with the output shaft of a winding motor; an unwinding pull rope is further fixed to the cross rod on the rightmost arc-shaped top beam and bypasses an unwinding idler pulley to be connected with the output shaft of an unwinding motor; cradling pieces are mounted and erected below the plastic film insulating layer. The grape planting trellis is simple in structure; as the top can be folded, sufficient lighting intensity is ensured, and manpower is saved.