Fire detector capable of increasing detection sensitivity

The utility model discloses a fire detector capable of increasing detection sensitivity, which comprises a mounting plate and a body, and the bottom of the mounting plate is movably connected with the top of the body. Through cooperative use of the mounting plate, the body, the butt joint groove, the storage groove, the fixing device, a moving hole, a pulling plate, a butt joint block and an annular groove, the body is picked up to make contact with the bottom of the mounting plate and drives the butt joint block to be inserted into the butt joint groove, then the pulling plate is loosened, and a pushing plate can automatically fall to the bottom of the storage groove; when a fire detector is installed, a spring elastically deforms to drive an extrusion plate to return to the original position, the extrusion plate moves to drive a clamping rod to penetrate through a storage groove into a clamping groove, convenient installation of the body is completed, and the problems that an existing fire detector is direc