The invention relates to a loading machine hydraulic system, and provides a hydraulic system for a loading machine working device in order to solve the problem that an existing reverse six-connecting-rod working device is poor in lifting translational motion. The hydraulic system comprises a high-pressure oil source, an oil tank circuit, a pilot control device, an action detection device, a gesture detection device and a gesture adjusting valve, wherein the high-pressure oil source and the oil tank circuit are connected with a movable arm oil cylinder and a rotating bucket oil cylinder througha distribution valve, the pilot control device controls a movable arm to rise and fall and controls an accessory to turn forwards and backwards, the action detection device is used for obtaining thestate of operation action of the pilot control device, and the gesture detection device and the gesture adjusting valve are used for detecting gestures of the accessory. The gesture adjusting valve isconnected between the rotating bucket oil cylinder and the high-pressure oil source, when the action detection device only detects that the pilot control device has movable arm lifting operation action, and the gesture adjusting valve fills oil to a big cavity or a small cavity of the rotating bucket oil cylinder according to the accessory gesture detected through the gesture detection device toenable the accessory to be adjusted to the reference position. In the movable arm lifting process of the loading machine, oil is filled into the big cavity or the small cavity of the rotating bucket oil cylinder according to the accessory gesture, and therefore a bucket opening of the bucket is kept lifting steadily upwards.