The invention discloses a roller washing machine. The roller washing machine comprises a box, a water tub, a motor, a circulating pump, a washing agent feeding device, a turbidity sensor, an electric conductivity sensor and a controller; a water outlet and a water returning opening of the water tub are connected through a circulating pipeline; the circulating pump enables water in the water tub to be circulated through the circulating pipeline; the turbidity sensor detects a first turbidity value of the washing water in the circulating pipeline after prewashing is finished and detects second turbidity values of the washing water every other a first preset time during main washing; the electric conductivity sensor detects electric conductivity values of the washing water in the circulating pipeline every other a second preset time during rinsing; the controller controls prewashing, generates a washing agent feeding amount signal according to the first turbidity value, controls main washing according to variable quantities of the second turbidity values and controls rinsing according to the variable quantities of the second electric conductivity values. The roller washing machine can be stopped when garments are washed clean and rinsed clean. The invention further discloses a control method of the washing machine.