A new selenite-sulfate compound Co-3(SeO3)(SO4)(OH)(2) was prepared using a typical hydrothermal reaction. This compound is found to crystallize in an orthorhombic space group of Pnma, featuring a 2D distorted kagome structure composed of linear and zigzag Co-chains, in which the magnetic ions construct different isosceles-triangles. Our results of magnetic and specific heat measurements confirm a canted antiferromagnetic order at T-N similar to 29 K. Further, the successive field-induced metamagnetic transitions can be observed at H-c1 similar to 1 T, H-c2 similar to 23 T, and H-c3 similar to 27 T, respectively. A clear magnetic hysteresis loop with a coercive field (H-c) of similar to 1.4 T is also observed.