An optical module, comprising a circuit board (P), a first chip , a second chip , and a lens assembly, the first chip and the second chip are arranged directly on the surface of the circuit board (P), and the lens assembly is arranged above the first chip and the second chip in a chip on board package where the first chip and the second chip are positioned between the lens assembly and the surface of the circuit board (P); the lens assembly comprises a first optic fiber insertion port (C1), a second optic fiber insertion port (C2), a first reflecting surface (F1), and a second reflecting surface (F2); and the first reflecting surface (F1) faces the first chip , the first reflecting surface (F1) faces the second reflecting surface (F2), and the second reflecting surface (F2) faces the first optic fiber insertion port (C1); there is a concave groove on the upper surface of the lens assembly, and the concave groove comprises a bump comprising a first pattern drafting face , a second pattern drafting face ; the first pattern drafting face is on a side at an inclined angle from a plane where the circuit board (P) is located; the second pattern drafting face is arranged opposite to the first pattern drafting face , and the second pattern drafting face is at an angle of 90° from the circuit board (P), and the second pattern drafting face is proximate to the first optic fiber insertion port (C1); the first pattern drafting face and the second pattern drafting face intersect with each other at an upper surface of the bump; the first reflecting surface (F1) is the first pattern drafting face and the second reflecting surface (F2) is the second pattern drafting face . the first chip and the second chip are arranged directly on the surface of the circuit board (P), and the lens assembly is arranged above the first chip and the second chip in a chip on board package where the first chip and the second chip are positioned between the lens assembly and the surface of the circuit board (P); the lens assembly comprises a first optic fiber insertion port (C1), a second optic fiber insertion port (C2), a first reflecting surface (F1), and a second reflecting surface (F2); and the first reflecting surface (F1) faces the first chip , the first reflecting surface (F1) faces the second reflecting surface (F2), and the second reflecting surface (F2) faces the first optic fiber insertion port (C1); there is a concave groove on the upper surface of the lens assembly, and the concave groove comprises a bump comprising a first pattern drafting face , a second pattern drafting face ; the first pattern drafting face is on a side at an inclined angle from a plane where the circuit board (P) is located; the second pattern drafting face is arranged opposite to the first pattern drafting face , and the second pattern drafting face is at an angle of 90° from the circuit board (P), and the second pattern drafting face is proximate to the first optic fiber insertion port (C1); the first pattern drafting face and the second pattern drafting face intersect with each other at an upper surface of the bump; the first reflecting surface (F1) is the first pattern drafting face and the second reflecting surface (F2) is the second pattern drafting face . <EOS>