The invention discloses a belt conveyor mechanism. The belt conveyor mechanism comprises a fixed bottom plate; four universal wheels are fixed to the outer wall of the bottom of the fixed bottom platethrough bolts; the four universal wheels are correspondingly positioned at the four corners of the outer wall of the bottom of the fixed bottom plate; a first support column and a second support column are fixed to the outer wall of the top of the fixed bottom plate through bolts; and the first support column and the second support column are correspondingly located at the positions, close to themiddle, on the two sides of the outer wall of the top of the fixed bottom plate. A transmission rod can be well driven to rotate; the transmission rod is wound with a steel wire, and a support rod rotates by taking the second rotating shaft as a fulcrum, so that the transmission angle is capable of being well adjusted, and the adjustability during device use is improved; and the problems that a belt transmission mechanism in a traditional technology is a whole, users do not conveniently fold the belt conveyor mechanism according to special conditions during use, and the folding property during the use is poor, the occupied space is great, and the use is extremely inconvenient are solved.