The vehicle-mounted electric workover rig without guy wire can effectively reduce labor intensity during the workover operation and improve the speed of workover operation.Based on theoretical mechanics and stability theory,the paper analyzes the stability in preventing rollover and rear-tipping during the operation of vehicle-mounted workover rig without guy wire.The results show that under rated hook load,the non-wire workover rig has sufficient stability to resist rollover and rear-tipping.