A tiltable/adjustable golf practice device includes multiple height adjusters mounted on the respective corners of the teeing ground. By means of lifting or lowering the height adjusters, the teeing ground can be tilted to simulate the landform of a real golf course in accordance with the requirement of a user in practice. The tiltable/adjustable golf practice device is free from any electronic control or hydraulic device so that the manufacturing cost is greatly lowered. Also, a user can freely remove the tiltable/adjustable golf practice device so that the application of the tiltable/adjustable golf practice device is facilitated.