The invention discloses an overload alarm device for a discharging platform. The overload alarm device for the discharging platform comprises a storage rack, a steel wire rope, a container, an overload alarm and a tension sensor, wherein the container is arranged on the storage rack, the steel wire rope is connected to the upper end of the storage rack and is placed at one end of the container, the tension sensor is arranged on the middle section of the steel wire rope, the two ends of the tension sensor are connected with the steel wire rope, and the signal output end of the tension sensor is connected with the signal input end of the overload alarm. Compared with the prior art, the overload alarm device for the discharging platform has the advantages that the load condition of the discharging platform is monitored through the tension sensor, alarm sounds are given out automatically for alarming when the load of the discharging platform is too large, workers are reminded to control the load of the discharging platform, in this way, equipment is prevented from breaking down, the safety coefficient can be increased, and the overload alarm device for the discharging platform has the use value and the promotion value.