The invention discloses a low-noise construction site pile driver. The low-noise construction site pile driver comprises a base, a protective shell and a PLC. A support is fixed to the middle of the upper end of the base through fixing cones; lifting rods are disposed on the two sides of the interior of the support; fixing blocks are fixedly connected to the lower ends of the lifting rods; a pile is fixed between the fixing blocks; a partition board is disposed outside the support; noise-absorbing cotton is disposed between the partition board and the protective shell; hanging boards are disposed in the middle of the upper end of the protective shell; the lower ends of the hanging boards are fixedly connected with a balancing weight; the upper ends of the hanging boards are fixedly connected with rope fasteners; electric lifters are fixedly connected to the two sides of the upper end of the protective shell; pulleys are fixedly connected to the upper ends of the electric lifters; and noise generated by pile driving is isolated inside the protective shell through the noise-absorbing cotton, so that the influence of noise on the surrounding is greatly decreased. The low-noise construction site pile driver is reasonable in design, simple in structure and suitable for being produced, applied and popularized.