The invention provides a mop jet-flow speed-variable washing spin dryer with magnetic-buckle connection and a self-locking lifting lateral axial column cylinder, wherein a rotary basket, a rotary basket support and a rotary basket lifting self-locking mechanism are disposed in a washing bucket. The spin dryer is characterized in that the lifting self-locking mechanism is designed to have a cylindrical brake rack rotary groove coaxial with the rotary basket on the washing bucket inner wall; an upper gear ring and a lower gear ring are disposed on the upper end and the lower end of the brake rack rotary groove; drive teeth are disposed on the upper gear ring; brake teeth, slide groove guide teeth and a brake rack slide groove are disposed on the lower gear ring; through upward lifting and pressing of the rotary basket, the brake rack on the rotary basket support can be switched between the brake teeth and the slide groove guide teeth, so that lifting control of the rotary basket is achieved, and whole courses including washing and spin-drying of a mop can be completed in one bucket through hand lifting and pressing; washing can be slowed down, and effort can be saved; the mop is connected to the rotation basket by a magnetic buckle, so the spin dryer can be operated more easily and has a longer service life; and jet flow wings are disposed on the rotary basket, so de-pollution ability is better.