The utility model provides a measure arc -welded joint adjusting device of molten bath temperature, belongs to welding equipment technical field. Robot connection pad, three not equidirectional temperature sensor clamping device, connect the welding torch spare and send the silk a first connecting piece, robot connection pad one end is the mounting flange structure, and the other end has the stripe shape recess, and the side of stripe shape recess is connected with and send first connecting plate of silk and connect the welding torch board, and three sensor clamping device connects three edges at the robot connection pad, and the molten bath direction of advance and the molten bath left and right sides are placed in to its three temperature sensor's measuring point branch. The utility model discloses can be with nimble the linking together of electric arc welder and temperature transducer, relative position between regulation electric arc welder and weldment that can be convenient, between temperature transducer and weldment, between electric arc welder and temperature transducer, final accurate measurement to the purpose of molten bath temperature that realizes connects quality and good shaping effect significant to guaranteeing hybrid welding.