The utility model relates to an upper electrode welded with multiple spots of a steel grating plate welding machine. The utility model solves the problem existing in the prior art that the electrode part of a double post steel grating plate welding machine adopt adjacent position welding of the left and right electrodes, only the double post can be welded at a time, therefore the working efficiency is not high and the effective resource of the welding machine is not fully utilized. To solve the technical problem, the technical proposal of the utility model adopts the key points that two side conductors and a middle conductor are arranged at both sides of a crossbeam in an insulated way, the middle conductor is connected with a middle electrode, the two side conductors are connected with a left side electrode and a right side electrode through connecting conductors, and insulating plates are arranged between the middle electrode and the left side electrode and between the middle electrode and the right side electrode. The utility model can be applied to the steel grating plate welding machine, the welding efficiency can be obviously improved, and the effective resource of the welding machine can be fully utilized.