A method for soldering a solar cell, includes: placing a plurality of back contact cells on a soldering platform, where 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 to-be-connected ribbons; placing the plurality of to-be-connected ribbons on the electrodes of the plurality of back contact cells by using a first clamping portion, a second clamping portion, and a plurality of third clamping portions, where the first clamping portion, the second clamping portion, and the plurality of third clamping portions respectively correspond to head ends, tail ends, and middle portions of the plurality of ribbons; and heating the plurality of ribbons by using a heater to connect the plurality of ribbons to the plurality of back contact cells.