The utility model relates to a supporting leg cover device of coal cash is prevented to mining high rubber overshoes. The colliery worker is very easily brought into the coal cash in walking and work chats boots. For solving above -mentioned technical problem, this supporting leg cover device of coal cash is prevented to mining high rubber overshoes includes mining high rubber overshoes, its characterized in that: still including preventing coal cash leg cover, prevent that coal cash leg cover is the tube -shape, set up in mining high rubber overshoes leg of a boot nozzle top that its diameter slightly is greater than mining high rubber overshoes leg of a boot nozzle diameter, its upper end is equipped with the elastic cord, and the lower extreme is equipped with two at least overlap joints and detains, and its lower extreme can cover mining high rubber overshoes leg of a boot nozzle, covers partial length for d, 2cm <= d <= 5cm, the mining high rubber overshoes leg of a boot nozzle outside with prevent that the inboard corresponding position of coal cash leg cover lower extreme is equipped with the overlap joint that equate quantity and detains. The utility model discloses supporting leg cover device of coal cash is prevented to mining high rubber overshoes can prevent effectively that coal cash, debris from getting into, and the dress is convenient, during the trade that extensively is applicable to mining industry etc. And needs wear high rubber overshoes is produced.