Disclosed is a threaded slider principle-based garden lawn mower. The threaded slider principle-based garden lawn mower comprises a support rack, the bottom of the support rack is fixedly connected with four wheels and provided with a groove open downwards, in which a blade adjusting device is arranged; the blade adjusting device is composed of two moving grooves symmetrically formed in the innerwalls of the groove, an adjusting plate is arranged between the two moving grooves, and the top of the adjusting plate is provided with an adjusting device; the adjusting device comprises two verticalplates, the top ends of the vertical plates are fixedly connected to the top of the groove, the two vertical plates are rotatingly connected with a rotating rod, one end of the rotating rod is fixedly connected with the output shaft of a driving motor, and the rotating rod is provided with a threaded section with both ends different in thread directions. The threaded slider principle-based gardenlawn mower has the advantages that the blade adjusting device can conveniently adjust the mowing height to achieve high applicability; a cut grass collecting device achieves efficient collection of cut grass to reduce the labor intensity for workers and improve the lawn mowing efficiency.