The invention relates to a reciprocating drill or an electric drill support, which comprises a triangular bracket, a reciprocating drill or an electric drill fixation clamp and a strut, wherein the triangular bracket comprises a support holder and three ground jacks connected with the support holder; the middle of the support holder is provided with a hole; a screw rod sleeve is internally and fixedly connected in the hole and is provided with an adjustable screw rod; the lower part of the adjustable screw rod is provided with a screw rod handle; the screw rod sleeve is internally provided with threads; the adjustable screw rod is provided with threads; the screw rod sleeve and the adjustable screw rod are matched to lift via threads; the top part of the adjustable screw rod is provided with a rest which is symmetrically provided with two shaft sleeves; a rotary shaft is internally arranged in the shaft sleeve; the axis of the strut passes through the circle center of the section of the rotary shaft and is fixed with the rotary shaft in a welding mode; the fixation clamp of the reciprocating drill or electric drill is fixed with the top end of the strut in a welding mode; and one end of a first thread sleeve is fixed with the rotary shaft in a welding mode. The reciprocating drill or electric drill support is applied to bear of the balcony concrete floor, overhang concrete slab and local floor in unmanned operation spaces, and has simple operation, safety and reliability, and is convenient to be applied to the bear of other parts of floor.