The invention relates to the field of welding robots, in particular to a dynamic stable multi-freedom-degree welding robot. The welding robot comprises a welding device and a first moving component which drives the welding device to horizontally move along the X axis; a second moving component for driving the first moving component to horizontally move along the Y axis is arranged at the bottom ofthe first moving component; a supporting column is arranged beside the second moving component; a sliding groove is formed in the side, close to the second moving component, of the supporting column;a third moving component for driving the second moving component to vertically move is arranged on the other side, far away from the second moving component of the supporting column; a driving deviceused for driving a supporting rod to move is arranged at the bottom of the supporting column; and a controller connected to the first moving component, the second moving component and the third moving component is arranged at the top of the driving device. The welding robot has the advantages that the structure is simple, multi-freedom-degree welding of welding parts can be realized through the first moving component, the second moving component and the third component, and the moving stability of the welding parts can be guaranteed through a gear and a fixing block.