The invention relates to a welding fixture used in bracket manufacturing for connecting an engine with a chassis; wherein, a liftout device is connected with an inner hole of a tube-shaped location seat in a sliding way which is arranged on an upper surface of a bottom plate; a support seat is fixedly arranged on the upper surface of the bottom plate at one side of the tube-shaped location seat and is articulated with a connection block which extends upward, and the top end of the connection block is articulated with a middle section of a press plate arm; a connection rod which is articulatedwith a back end of the press plate arm and the connection rod is articulated with an output end of a power device, and the back end of the press plate arm is fixed with a pressure head which extends downward; a small bracket location block is arranged at one side of the support seat and is fixedly provided with a platy convex stop block and the pressure head which is matched with the platy convexstop block; platy convex location seats and a clamping seat of a left bracket and a right bracket are arranged at symmetrical position of both sides of the tube-shaped location seat; a through hole which is internally connected with a location pin in a sliding way is arranged on the location seat; a platy pressure head is articulated with the clamping seat. The welding fixture has the advantages of ensuring smaller deformation, no welding slag on the assembly surface, etc.