Micro shaft for mobile phone guide rail

The invention discloses a micro shaft for a mobile phone guide rail. The micro shaft comprises a connection part, a micro shaft body, a positioning device, a mobile device and an extended shaft device, wherein the connection part is provided with connection holes; the micro shaft body is provided with first through holes, lugs and first positioning blocks; the positioning device comprises a first positioning frame, a second positioning frame, first springs, first vertical rods, second springs and elastic sheets; the mobile device comprises fixing rings, third springs, mobile frames, second positioning blocks, a mobile plate and fourth springs; the extended shaft device comprises an extended shaft, a connecting rod and fifth springs; a left end of the connecting rod is fixedly connected with a right surface of the extended shaft; a right end of the connecting rod passes through the first through holes to be fixedly connected with a left surface of the mobile plate; upper and lower surfaces of the connecting rod are provided with long striped grooves; the lugs are accommodated in the grooves; and left ends of the fifth springs are fixedly connected with the right surface of the extended shaft. The length of the micro shaft can be adjusted as required, thereby expanding an application range of a product, and greatly increasing the benefits of enterprises.