The invention relates to the technical field of batteries and discloses a battery and a parallel connection method for soft polymer cells. Two connecting parts wrap a cathode tab parallel connection end and an anode tab parallel connection end respectively and bear most applied force, so that tabs of the soft polymer cells almost bear no force in a parallel connection process, and welding spots formed through laser welding of the tabs on cathodes and anodes in the soft polymer cells are not prone to falling; besides, the soft polymer cells are connected in parallel through the two connecting parts fixed on a circuit board, accordingly, irreparable damage to inside of the soft polymer cells due to local high temperature of the soft polymer cells can be avoided, phenomena such as electrolyte leakage, swelling and the like of the soft polymer cells in a follow-up application process are avoided, the technical problem that bodies of the soft polymer cells are not resistant to heat is solved, and the battery has long-term endurance ability in an application process.