The utility model relates to an outdoor automatic soldering tin rifle, press from both sides and the electrowelding wire installing support including body of a gun main part, soldering tin heating head, alkane accumulator, burner nozzle, power, direct current motor gear change mechanism, soldering tin conveying, soldering tin heating head sets up the front end in body of a gun main part, and alkane accumulator and burner nozzle install the top in body of a gun main part, the soldering tin conveying is pressed from both sides and is installed in the below of body of a gun main part, and the below at soldering tin heating head is installed to the one end that the soldering tin conveying was pressed from both sides, the electrowelding wire installing support is installed and is linked to each other with direct current motor gear change mechanism in the rear end of body of a gun main part, and direct current motor gear change mechanism links to each other with the power, and the electrowelding wire twines on the electrowelding wire installing support. Thoroughly solve the not hard up and contact failure's of circuit nodal connection on -the -spot problem, enhancing power supply reliability. Low cost has fine economic benefits and practical value, is suitable for the large tracts of land and uses widely.