Machining die and machining method for drilling cross holes in two ends of long rectangular pipe

The invention discloses a machining die and method for drilling cross holes in the two ends of a long rectangular pipe, the machining die comprises a plurality of supporting bases arranged at equal intervals and a positioning tool transversely fixed to the supporting bases, and the positioning tool comprises a long rectangular positioning die body transversely fixed to the supporting bases and positioning assemblies arranged at the two ends of the long rectangular positioning die body; the positioning assembly comprises a drilling positioning block, a supporting pin rod and a pressing fixing piece, one end of the drilling positioning block is fixed to the surfaces of the two ends of the long rectangular positioning die body, and the other end of the drilling positioning block horizontally, outwards and vertically extends out of the upper portion of the long rectangular pipe along the surfaces of the two ends of the long rectangular positioning die body; a drilling guide hole penetrating in the vertical direct