The invention relates to a brick making production line which comprises a hydraulic forming machine, an automatic feeder, a positioning machine and a robot. The hydraulic forming machine is used for pressing green bricks, the automatic feeder is used for conveying a steam curing car to a brick stacking area in a suspension manner, the positioning machine is used for limiting the steam curing car until the steam curing car reaches the brick stacking area, the robot is used for performing green brick stacking operation on the steam curing car, and the positioning machine comprises a support arm and a cylinder used for lifting the support arm or laying down the support arm; the positioning machine is fixed to the upper end surface of a slider, the slider is in sliding fit with a guide rail, a buffer device is arranged at the left end of the guide rail and is used for buffering impact force, which is generated when the steam curing car is collided with the positioning machine, on the slider, and the right end surface of the buffer device is in close contact with the left end surface of the slider. The brick making production line has the advantage that the buffer device buffers the impact force on the slider when the steam curing car is collided with the lifted support arm, so that pressure, which is caused by collision of the steam curing car, on the cylinder can be relieved.