The invention provides automatic overturning equipment for middle groove double-sided welding. The automatic overturning equipment comprises a control system, an overturning mechanism, four conveyingmechanisms, a clamping mechanism and two lifting mechanisms, one pair of the conveying mechanisms are arranged inside the overturning mechanism in an upper and lower opposite manner, the other pair ofthe conveying mechanisms are connected with two opposite ends of the bottom conveying mechanisms inside the overturning mechanism correspondingly, the middle of any one of the conveying mechanisms isan unoccupied portion and two sides of any one of the conveying mechanisms are conveying portions, one of the lifting mechanisms is arranged at the unoccupied portion of one of the conveying mechanisms outside the overturning mechanism, an upper compressing component and a lower compressing component of the clamping mechanism are arranged at the unoccupied portions of the pair of the conveying mechanisms inside the overturning mechanism correspondingly, the control system is in electric connection with power sources of the overturning mechanism, the conveying mechanisms, the clamping mechanism and the lifting mechanisms, and when a large gear ring of the overturning mechanism rotates, two of the conveying mechanisms and the clamping mechanism are driven to rotate simultaneously. By meansof the automatic overturning equipment for middle groove double-sided welding, the efficiency is improved intelligently, the safety factor is improved, the application range is wide, and the stabilityperformance is improved.