Construction monitor convenient to mount and dismount

The construction monitor comprises a vertical rod, a monitor body and a connecting block, a clamping plate is arranged on one side of the vertical rod in a sleeved mode, an arc-shaped groove is formed in the side, close to the vertical rod, of the clamping plate, racks are fixed to the two sides of the clamping plate, and the connecting block is arranged on the side, away from the clamping plate, of the vertical rod. And a first limiting groove is formed in the connecting block. According to the construction monitor convenient to mount and dismount, the original mounting mode that bolts are matched with hoops is changed, the gear is engaged with the rack by inserting the rack into the limiting groove, and meanwhile, rotation of a worm gear is limited through a worm, so that the gear is locked, and a clamping plate and a connecting block are matched with each other and fastened to a vertical rod; the construction monitor can be conveniently and rapidly mounted and dismounted, a limiting block is moved through