The invention discloses a mixed soil extruded and cured precast 
pile for soft foundation treatment as well as a construction method. Foundation soil is connected with 
drill holes which are connected with mixed soil extruded and cured precast 
pile bodies, the mixed soil extruded and cured precast 
pile bodies are connected with 
cement mortar through a central hole, and the 
cement mortar is connected with a seamless steel 
pipe which is connected with a grouting 
pipe. The construction method comprises the following steps: A, a vibrating 
pipe-sunk pile 
machine is adopted for hole forming; B, the mixed soil extruded and cured precast pile bodies are placed; C, the seamless steel pipe is placed, and a vibrating sunk pipe is pulled out; D, grouting is performed: the a seamless steel pipe is connected with the grouting pipe, pressure 
cement mortar is grouted into the seamless steel pipe, and the seamless steel pipe and the precast pile bodies form the integral mixed soil extruded and cured precast pile after mortar curing; E, integral construction is performed. The mixed soil pile is precast by waste 
construction waste and common clay, the manufacture is convenient and fast, the quality is reliable, the transport cost is reduced, modular piling construction is efficient and convenient, and the integral 
bearing capacity of a foundation is improved effectively.