The utility model discloses an accurate mixed slip casting structure of biliquid deep hole hole bottom fixed point, it has solved the accurate mixing problem of biliquid slip casting, can be through the ratio of the quantitative regulation biliquid of two high -pressure PVC slip casting pipes, control setting time, the two liquid -slurry of realization make biliquid slip casting scope artificially control in hole bottom predetermined location's mixture, accurate biliquid slip casting is fixed a point and the biliquid can be reduced in mixing distance and time in the drilling, increase couple liquid -slurry 's spread range, easy operation. Its technical scheme does: including the steel casing pipe, set up two slip casting pipes in the steel casing pipe, one of them slip casting nose portion is connected with first rodding, and another slip casting nose portion is connected with the second rodding, slip casting socle portion lateral wall has to end starches the stopper, end the thick liquid beyond the great wall the portion fill out between slip casting pipe and steel casing pipe and establish the shutoff body.