The invention discloses a split type gantry beam for an electric drive mining-use dumper frame and belongs to the technical field of dumper frames. A split structure of an upper gantry beam body, a lower gantry beam body and a deck support is adopted. The gantry beam structure is simple in positioning and point splicing process, welding formation is easy to control, the attachment situation between the gantry beam and a corresponding longitudinal beam is easy to adjust, and a mounting process is simplified to a great degree; front suspension supports, pull rod seats and steering middle seats are assembled, welded and then machined, and the relative position of a hole is easy to guaranteed, so that positioning parameters of a front axle main pin and a steering trapezoid can be strictly guaranteed; medium machining and finish machining are adopted for small assemblies, machining is easy to conduct, the cycle is short, cost is low, and production is easy to arrange; a casting structure is adopted for the complex stressed position, and a swallow-tail form structure or a stiffened plate is adopted to reduce structural sudden change, so that the gantry beam can bear a large bending load, a twisting load and an impact load, stress concentration of a stress concentrated area is reduced, breakage and damage of a structural piece are avoided, and meanwhile various functional requirements are met.