Quick positioning fixture for numerical control linear cutting machine

A quick positioning fixture for a numerical control linear cutting machine is characterized by comprising a U-shaped support, a slider and a screw adjusting mechanism, wherein a pair of slide ways matched with the slider are arranged on two arms of the U-shaped support, a first V-shaped clamping opening is arranged in the middle of the U-shaped support, and a second V-shaped clamping opening corresponding to the first V-shaped clamping opening is arranged on the slider. In one improvement, four data acquisition posts in two groups are arranged in a first coordinate direction and a second coordinate direction respectively, and an origin of a coordinate of the fixture can be determined conveniently and quickly. After initial positioning, no repositioning is needed during processing of round or square workpieces of different sizes in a same batch by the fixture, and thereby positioning precision is high, operation is convenient and operating efficiency is more than doubled.