Weighing system and method of excavator and excavator

The application provides a weighing system and method of an excavator and the excavator, and relates to the field of excavators. The weighing system of the excavator comprises an angle measuring module, a pressure measuring module and a controller; the controller is connected with the angle measuring module and the pressure measuring module; the angle measuring module is used for measuring a firstangle, a second angle and a third angle; the first angle is an included angle between the direction of a moving arm and the gravity direction; the second angle is an included angle between the direction of a bucket rod and the gravity direction; the third angle is an included angle between the direction of a bucket and the gravity direction; the pressure measuring module is used for measuring first pressure; the first pressure represents for the magnitude of a force of supporting the moving arm by a moving arm cylinder of the excavator; and the controller is used for determining the weight ofa to-be-measured material