The invention discloses a monitoring device with an angle adjusting function for the Internet of Things. A bottom plate is included, a supporting column is in bolted connection to the center of the top of the bottom plate, a supporting seat is in bolted connection to the top of the supporting column, a box body is in bolted connection to the top of the supporting seat, a rotating mechanism is arranged in an inner cavity of the box body, the top of the rotating mechanism penetrates through the box body and is in bolted connection with a supporting plate, the top of the supporting plate is in bolted connection with a mounting base, the front face and the back face of the top of an inner cavity of the mounting base are movably connected with a camera through a movable shaft, and a fixing plate is in bolted connection to the left side of the bottom of the supporting plate. Through cooperation of a low-speed motor, a first rotating shaft, a guide cylinder, a belt, a guide column, a toothed plate, a gear and a second rotating shaft, a user can conveniently use the belt to drive the toothed plate to move, so that the gear is driven to rotate under the assistance of the second rotating shaft, and then the left-right angle of the camera is randomly adjusted.