Bridge pile foundation drilling device

The invention relates to the technical field of bridge construction pile drilling, in particular to a bridge pile foundation drilling device which is used for solving the problem that according to an existing device, a drill bit needs to be frequently replaced for different stratums, and the construction efficiency is influenced, the drilling device comprises a drilling mechanism, the drilling mechanism comprises a drilling rod, and a drilling barrel is connected to the drilling rod; the lower part of the drill cylinder is connected with two cutting plates; cutting teeth are arranged on the two cutting plates; the two cutting plates can synchronously and reversely swing; when the included angle between the two cutting plates is increased, the drilling quantity of the cutting teeth into the stratum is increased; when the included angle between the cutting plates is increased, the amount of the cutting plates penetrating into a soil layer is increased, so that the soil sampling speed is increased when the drill