Telescopic tarpaulin top cover

The utility model discloses a telescopic tarpaulin roof board, comprising a piece of tarpaulin, a rotation shaft and a plurality of support bars. The tail ends of the support bars can be rotatably connected to the rotation shaft, with an air spring connected between every two adjacent support bars. The air springs can take a buffer function for relative movement between two support bars which can not collide or impact under action of gravity during rotating, which makes telescopic movement of the roof board very stable, avoids destroying the tarpaulin and the support bars, thereby extending service life of the roof board.