The invention discloses a silicon ingot suitable for solar crystal silicon wafers. The silicon ingot comprises a silicon ingot body, a through groove formed in the side surface of the silicon ingot body and/or a through hole formed in the silicon ingot body, the through groove and the through hole extend in a straight line, and the through groove and the through hole are formed corresponding to agrid line of a solar battery piece. According to the silicon ingot, the through groove or the through hole is formed in the silicon ingot in advance, then the silicon ingot is directly cut into a crystal silicon wafer with the through groove, equipment does not need to be additionally arranged for manufacturing the through groove after the battery piece is formed, grooving of each battery piece isnot needed, the process is simplified, and energy consumption and cost are reduced. According to the arrangement of the through groove and the through hole, a preset cutting path is heated by laser,then the cutting path is cooled with water, and the silicon ingot is disconnected along the cutting path through cold and hot alternation to form the through groove or the through hole, so that an obtained cross section is neat and free of cracks, and the battery piece hidden cracking risk is reduced.