A mop capable of being decelerated during cleaning comprises a mop rod, a mop plate and a friction device, wherein a wiping object is arranged on the mop plate; the mop rod comprises an inner rod body and an outer rod body which are connected with each other in a sleeving manner; a driving mechanism is arranged between the inner rod body and the outer rod body; when the outer rod body is pressed downwards, the driving mechanism converts downward pressing movement of the outer rod body into rotation of the inner rod body; and the inner rod body is connected with the mop plate. During cleaning, the outer rod body is pressed downwards, the driving mechanism drives the inner rod body to rotate, and the inner rod body drives the mop plate to rotate through the friction device; and when the mop plate rotates in water and is cleaned, the resistance on the mop plate and a friction force generated on the friction device are balanced, and therefore, the mop plate rotates in a decelerating manner during cleaning. The mop plate which moves in the decelerating manner is simple in structure, and the mop is quite smooth during cleaning.