A method for soldering a solar cell, comprising: placing a plurality of back contact cells on a soldering platform, wherein back surfaces of the back contact cells face away from the soldering platform, and electrodes corresponding to two adjacent back contact cells have opposite polarities in a connection direction of a plurality of ribbons; and a gap is formed between each two adjacent back contact cells; grabbing the plurality of ribbons by using a first clamping portion, a second clamping portion, and a plurality of third clamping portions; wherein the third clamping portions comprise cutting members; and the ribbons comprise a plurality of first ribbons and a plurality of second ribbons; simultaneously placing the plurality of ribbons on the electrodes of the plurality of back contact cells by using the first clamping portion, the second clamping portion, and the plurality of third clamping portions, wherein the first clamping portion and the second clamping portion respectively correspond to head ends and tail ends of the plurality of ribbons; and each third clamping portion corresponds to one gap; cutting clamped portions of the plurality of first ribbons by using the cutting members corresponding to the first ribbons; and cutting clamped portions of the plurality of second ribbons by using the cutting members corresponding to the second ribbons; wherein either each third clamping portion is configured to clamp the plurality of first ribbons and the plurality of second ribbons; or, a first plurality of third clamping portions is configured so that each first ribbon at one gap is clamped by one third clamping portion of the first plurality, and a second plurality of third clamping portions is configured so that each second ribbon at an adjacent gap is clamped by one third clamping portion of the second plurality; and simultaneously heating the plurality of ribbons by using a heater to simultaneously connect the plurality of ribbons to the plurality of back contact cells, so that the back contact cells are connected in series in the connection direction of the plurality of ribbons. placing a plurality of back contact cells on a soldering platform, wherein back surfaces of the back contact cells face away from the soldering platform, and electrodes corresponding to two adjacent back contact cells have opposite polarities in a connection direction of a plurality of ribbons; and a gap is formed between each two adjacent back contact cells; grabbing the plurality of ribbons by using a first clamping portion, a second clamping portion, and a plurality of third clamping portions; wherein the third clamping portions comprise cutting members; and the ribbons comprise a plurality of first ribbons and a plurality of second ribbons; simultaneously placing the plurality of ribbons on the electrodes of the plurality of back contact cells by using the first clamping portion, the second clamping portion, and the plurality of third clamping portions, wherein the first clamping portion and the second clamping portion respectively correspond to head ends and tail ends of the plurality of ribbons; and each third clamping portion corresponds to one gap; cutting clamped portions of the plurality of first ribbons by using the cutting members corresponding to the first ribbons; and cutting clamped portions of the plurality of second ribbons by using the cutting members corresponding to the second ribbons; wherein either each third clamping portion is configured to clamp the plurality of first ribbons and the plurality of second ribbons; or, a first plurality of third clamping portions is configured so that each first ribbon at one gap is clamped by one third clamping portion of the first plurality, and a second plurality of third clamping portions is configured so that each second ribbon at an adjacent gap is clamped by one third clamping portion of the second plurality; and simultaneously heating the plurality of ribbons by using a heater to simultaneously connect the plurality of ribbons to the plurality of back contact cells, so that the back contact cells are connected in series in the connection direction of the plurality of ribbons.