The present invention relates to the technical field of washing machine detection control. Provided are a roller washing machine and an unbalance detection method and device thereof. The method comprises: when a roller operates at a low constant speed, detecting the torque of the roller and acquiring average torque values; when the roller operates at a constant acceleration speed, acquiring average torque values and a minimum value of the average torque values of the roller in real time; determining whether a difference between each average torque value and the minimum value of the average torque values is greater than a preset unbalance threshold; and if the difference is greater than the preset unbalance threshold, determining that dynamic unbalance occurs on the roller; otherwise determining that dynamic unbalance does not occur on the roller. Accordingly, in the present invention, a sensor is not needed for unbalance detection, so that cost and the detection difficulty are lowered, and the problem of dama
