The invention discloses a multi-tin-nozzle type selective crest tin soldering machine. The tin soldering machine comprises a tin soldering mechanism, a tin groove, a tin supply mechanism which conveys tin in the tin groove to the tin supply mechanism and a heating mechanism. The tin soldering mechanism is arranged on the tin groove, the tin supply mechanism is arranged in the tin groove, and the heating mechanism is fixedly connected to the bottom end of the tin groove. The tin soldering mechanism is provided with a plurality of nitrogen outlets, and each nitrogen outlet extends to form one or more tin nozzles. According to the multi-tin-nozzle type selective crest tin soldering machine, the tin supply mechanism conveys liquid tin to the tin nozzles in the tin soldering mechanism to be sprayed out, and the liquid tin flows back to the tin groove from the nitrogen outlets. Compared with the prior art, the tin soldering mechanism is provided with the multiple tin nozzles, the machining efficiency is improved manyfold, the device size is small, the machining cost is low, the energy consumption is low, and the failure rate is low; and in addition, each tin nozzle is surrounded by nitrogen released from the nitrogen outlets, the nitrogen can play a role in preventing the liquid tin from being oxidized, and the tin soldering quality is guaranteed.