Air chamber type local dry-method underwater welding robot

The invention discloses an air chamber type local dry-method underwater welding robot which comprises a floating body, a pressure-resistant cabin, a robot frame, a battery, a protective gas compression bottle, triangular walking tracks and propellers. The floating body is installed at the top of the robot frame; the top and the tail of the robot frame are each symmetrically provided with a pair of propellers; the pressure-resistant cabin is installed in the robot frame; a robot frame chassis is provided with a welding pretreatment module, an underwater welding work module battery and an engine; and the engine is connected with the triangular walking tracks through a transmission shaft. According to the air chamber type local dry-method underwater welding robot, the underwater welding robot is provided with the welding pretreatment module so as to have the function of pretreating the welding part of a pipeline, so that the actual welding condition is improved; the air chamber type local dry-method underwater w