The invention discloses a load weight recognition method and device of an impeller washing machine and the impeller washing machine. The impeller washing machine comprises an impeller and a motor, the impeller is driven by the motor to ascend and descend. The load weight recognition method and device of the impeller washing machine includes the following steps that the motor is controlled to start work so that the impeller can be lifted; in the lifting process of the impeller, the work current of the motor is collected; according to the work current of the motor, the load weight of to-be-washed clothes in the impeller washing machine is calculated. By means of the load weight recognition method of the impeller washing machine, the load weight of the impeller washing machine can be effectively recognized, therefore the intelligent degree of the impeller washing machine can be improved, energy consumption is reduced, and the market competitiveness of products is improved.