A rear landing leg elevating and stress monitoring system in a moving die carrier is characterized in that two rear landing legs and two middle landing legs are both equipped with force measurement sensors, and the displacement sensors are arranged on the two rear landing legs and the two middle landing legs and are arranged relatively; the rear landing leg oil cylinders are connected with a rear landing leg hydraulic pressure station, and the middle landing leg oil cylinders are connected with a middle landing leg hydraulic pressure station; when the moving die carrier elevates, a PLC real-timely monitors the elevation amplitudes of the left and right rear landing legs and the two middle landing legs via the displacement sensors, and when the height difference of the left and right rear landing legs or the left and right middle landing legs exceeds a set value, for example 30 millimeters, the PLC cuts off the power supply of the rear landing leg hydraulic pressure station and the middle landing leg hydraulic pressure station, thereby effectively preventing the overlarge left and right height difference of the moving die carrier, and preventing a device from overturning. At pouring, the force measurement sensors transmit the strain of the two rear landing legs and the two middle landing legs, when the bearing reaction of the two rear landing legs or the two middle landing legs reaches a bearing reaction early warning value, the alarm information is given out to remind the operation personnel to process timely.