Opening and closing device of upper cover of washing machine and washing machine

The invention discloses an opening and closing device of an upper cover of a washing machine and the washing machine. The opening and closing device comprises a control device and a telescopic mechanism, wherein a lever is formed on the upper cover and can rotate around a rotating shaft, and the telescopic mechanism is connected with one end of the lever and can drive the lever to rotate under the control of the control device, so that the upper cover is opened and closed. According to the opening and closing device of the upper cover of the washing machine, the upper cover of the washing machine is opened and closed by the aid of a nut-screw transmission structure, the fixed transmission ratio can be set for the nut-screw transmission structure usually, so that the upper cover of the washing machine has the stable movement speed at any angle during opening or closing, and opening and closing stability and reliability of the upper cover are guaranteed.