The utility model discloses a coal mining machine with a wide inclined angle and an oil absorbing device thereof. The oil absorbing device comprises an oil absorbing pipe, an oil absorbing valve and a gravity mechanism, wherein the oil absorbing valve is arranged at one end of the oil absorbing pipe and is connected with an oil absorbing end of a filter through the oil absorbing pipe; the gravity mechanism is arranged on the oil absorbing valve; and the oil absorbing valve is located at the lowest end of oil level all the time under the gravity action of the gravity mechanism, thereby adapting to the change in oil level of a hydraulic tank of the coal mining machine caused by a coal bed with wide inclined angle on a working surface. The oil absorbing problem of a heightening pump of the coal mining machine during the process of mining the coal bed with the wide inclined angle is solved by the coal mining machine with the wide inclined angle and the oil absorbing device thereof provided by the utility model. According to the oil absorbing device, the oil absorbing pipe is connected with the oil absorbing end of the filter, the oil absorbing valve is connected with the other end of the oil absorbing pipe, a gravity ball is connected with the oil absorbing valve, the oil absorbing valve is located at the lowest end of oil level all the time under the driving of the gravity ball, and the normal oil absorption of a pump is ensured, so that the reliability of the coal mining machine is greatly increased and the high-efficient mining of the coal mining machine is ensured.