A lens bracket assembly for supporting an imaging device. The imaging device includes a body and a lens connected to the body. The lens bracket assembly includes a mounting plate, a supporting plate configured for carrying the imaging device, and a bracket. The mounting plate includes a first surface and two inner sidewalls extended from two opposing ends of the first surface along a direction substantially perpendicular to the first surface. The two inner sidewalls provide first sliding slots. The supporting plate includes a first side and two outer sidewalls providing second sliding slots, and is slidably disposed on the mounting plate with the second sliding slots matching the first sliding slots at corresponding positions. The bracket is coupled to the first side of the supporting plate, and includes a shape that matches the lens of the imaging device.