The invention discloses a construction method for treatment of a tunnel passing through karst areas, and relates to the technical field of tunnel construction. The construction method for treatment ofthe tunnel passing through the karst areas comprises the following steps that (1) geological survey is conducted; (2) risk elimination is conducted, and packing is cleared; (3) the development situation of a karst cave is checked; (4) a temporary protection shelter is manufactured and mounted; (5) a groove is chiseled in a karst cavity wall, and an anchor rod is arranged; (6) a waterproof board and a drainage tube are mounted; (7) preliminary bracing is conducted and a pumping pipe is pre-buried; and (8) concrete is pumped layer by layer. According to the construction method for treatment ofthe tunnel passing through the karst area, the advantages can be effectively performed, the construction progress is accelerated, material waste is reduced, the construction cost and potential safetyhazards are lowered, the construction quality of the tunnel and the overall structure stability are effectively improved, and good economical benefits and social benefits are achieved.