The invention discloses an efficient adjustable biogas slurry filtering device which comprises a box body, wherein a liquid inlet pipe is mounted in the middle of the left end of the box body; a liquid discharge pipe is mounted at the bottom of the right end of the box body; the bottom surface of the box body adopts a left-high and right-low inclined structure; a plurality of groups of filtering units arranged at intervals are mounted on the inner wall of the box body; each group of filtering units comprises a titanium alloy filter screen and four mounting grooves; every two mounting grooves are symmetric and are fixedly connected onto the two sides of the inner wall of the box body; every two mounting grooves formed in the same side are formed at an interval; each titanium alloy filter screen is inserted in the two corresponding adjacent mounting grooves; the box body is divided into a plurality of independent spaces by the filtering units; a biogas slurry chamber is arranged at the leftmost end; a straining chamber is arranged between every two adjacent filtering units; a refined filtration chamber is arranged at the rightmost end. The device has the advantages that the filter efficiency is high, the filtration precision is adjustable and stable, the filter material does not need to be replaced, and the long-term stable operation can be ensured only by washing.