The invention relates to a multifunctional pile driver comprising supports, a carrier plate, a power connector and a wire. The supports are disposed at four corners of the carrier plate. A fixed frame is fixed on the surface of the carrier plate. A bit rail is fixed within the fixed frame. A bit body is fixed within the bit rail. A pressure pump is fixed within the fixed frame at the top end of the bit body. A bit is fixed to the bottom end of the bit body. The left side of the carrier plate is provided with the power connector. A pressure detector is disposed between the bit body and the pressure pump and is connected with the power connector through the wire. The multifunctional pile driver has the advantages of simple structure and low manufacturing cost.