The invention belongs to the field of medicinal preparations, and discloses an indissolvable 
drug oral sustained-release dry 
emulsion tablet and a preparation method thereof. The preparation method for the oral sustained-release dry 
emulsion tablet comprises the steps that after an 
oil phase, a surface 
active agent and cosurfactant are evenly mixed, an indissolvable 
drug is added till the 
drug is dissolved completely, and accordingly a 
medicine-carried self-emulsifying 
system is prepared; after the 
medicine-carried self-emulsifying 
system and an 
aqueous solution of a hydrophilic gel framework material are evenly mixed, 
spray drying is conducted, and sustained-release dry 
emulsion powder is obtained; after the sustained-release dry emulsion 
powder and a conventional tablet auxiliary material needed for preparation are mixed, wet 
granulation is carried out; at last, tabletting is performed. The sustained-release dry emulsion tablet can improve the 
dissolution and dissolving-out performance of the indissolvable drug, the 
bioavailability of the indissolvable drug is improved, a stable 
blood concentration is formed, and the compliance of patients is improved. The sustained-release dry emulsion tablet is not complex in composition of prescription, and the preparation technology is suitable for industrial production.