The utility model provides a door and window entrance to a cave side direction supports safety device with adjustable. Main solve current protector install and remove inconvenient, problem that work load is big. Its characterized in that: the protecting tube both ends all are equipped with roof pressure mechanism, roof pressure mechanism is used for withstanding the fixed protecting tube of door and window entrance to a cave both sides wall, be equipped with drive adjustment mechanism between protecting tube and the roof pressure mechanism, drive adjustment mechanism is used for driving roof pressure mechanism and pushes up tight wall. Its advantage lies in respectively that the protecting tube can adjust the position of roof pressure mechanism through the drive adjustment mechanism at both ends, makes its the tight door and window entrance to a cave both sides in top wall to the fixed setting in entrance to a cave position through multiunit protecting tube horizontal arrangement, just can reach protecting effect, compares with prior art, need not to put up the support, need not use various link members, simple structure, and it is more convenient to install and remove, the material resources of using manpower sparingly.