Coalbed methane content is a critical parameter for characterizing coal reservoir properties. The most direct and effective way to improve the accuracy of the test results of coalbed methane content is to use sealed pressure-holding coring technology， wherein the coal core sample is sealed inside the drilling tool and lifted to the ground for desorption. This paper proposes a technical scheme for a wireline-retrievable lifting and tilting ball valve type sealed pressure-holding coring drilling tool used for crushed soft coal seams. The working mechanism and key technologies of the sealed pressure-holding coring drilling tool are studied， and the overall structural scheme of the sealed pressure-holding coring drilling tool， the structural design calculation of the main components， preliminary indoor experiments， and optimization improvement plans are elaborated in detail. Research and experiments have shown that the sealed pressure-holding coring drilling tool has a simple structure， good sealing effect， easy operation， and can obtain the maximum feasible core diameter （a core diameter of 50mm can be obtained from a 118mm diameter borehole）； The precise fit between the lever and the ring that drives the ball valve to flip is an important factor in determining whether the ball valve can smoothly flip and seal.