Gap squeezing tool for step gap screen tube

The invention discloses a gas squeezing tool for a step gas screen tube. The gas squeezing tool adopts the following types: a groove gas squeezing knife, a double-blade furrow gas squeezing knife and a circular wheel extrusion knife. One side of the groove gap squeezing knife is a flat blade while the other side is an inclined blade, and a groove is squeezed along the gap; the double-blade furrow gas squeezing knife has two blades with two bumps riding on two sides of the gap with the squeezed groove, a furrow is extruded, and thereby bulges are formed nearby; the circular wheel of the circular wheel extrusion knife is installed in the knife handle to rotate, and used for pressing the furrow and the bulges, and thereby a step gap with narrow outer side and wide inner side is formed.