Engineering pile with precast pile as supporting stand column and stand column pile and construction method

The invention discloses an engineering pile with a precast pile as a supporting stand column and a stand column pile and a construction method. The engineering pile comprises a temporary part which is located above a structural bottom plate during construction and needs to be cut off in the construction process, and a permanent part which is connected with the structural bottom plate and located below the structural bottom plate. Carbon fiber cloth is laid on the outer side wall, close to the joint of the temporary part, of the permanent part; the structural bottom plate is divided into an upper part and a lower part along the boundary of the temporary part and the permanent part; a support used for bearing loads in the horizontal direction is arranged at the upper end of the temporary part. During construction, precast piles are driven in first, then a support is arranged at the upper end of the temporary part, and then a foundation pit is excavated; after the pre-pouring structure for connecting the structu