The invention discloses an excavator load testing device. The device comprises a bucket rod, a connecting rod, a rocker, a bucket, a cardan joint, pressure sensors, an angle sensor, a bidirectional pin shaft sensor and the like which are obtained after transformation, wherein the middle of the bucket rod is cut at a certain position, the two parts obtained after cutting are connected through the cardan joint, and the connecting position is fixed through the pressure sensors so as to prevent relative displacement; the angle sensor is installed between the connecting rod and the rocker, the bucket rod and the bucket are connected through the bidirectional pin shaft sensor, and a hydraulic rod is connected with the connecting rod through the pressure sensors. By the adoption of the device, the problem that loads, in all directions, of an excavator can not be accurately measured in general is solved, and especially, bucket lateral torque measurement is achieved.