Water tank convenient to install

The water tank convenient to install comprises a base, a top plate, a telescopic water storage bag and a supporting unit, the top plate is arranged over the base, the telescopic water storage bag is arranged between the bottom of the top plate and the top of the base, a water injection pipe is arranged at the left end of the top plate, and a water drainage pipe is arranged in the middle of the front side of the base. Placement grooves are formed in the left end and the right end of the top of the base correspondingly, supporting units are arranged in the placement grooves correspondingly, each supporting unit comprises a supporting sleeve, a threaded rod, an adjusting piece, a clamping ring, a square block, a U-shaped positioning block and two sets of fixing shafts, and the fixing shafts are arranged at the front end and the rear end of the interior of each placement groove in a bilateral symmetry mode correspondingly; according to the water tank convenient to install, the size of the telescopic water storage