The invention relates to a trapping device and process for the production of o-chlorobenzonitrile, comprising a multi-stage trapping melter, an intermediate tank (2), a liquid separator (3), an aqueous phase receiving tank (4), a flocculation solids receiving tank (5), organic phase receiving tank (6); the trapping melters at all levels are connected in series in sequence, and the trapping melters at all levels are connected to the middle tank (2), and the middle tank (2) is connected to the liquid separation through the pump The device (3) and the liquid separator (3) are respectively connected to the parallel water phase receiving tank (4), the floc receiving tank (5) and the organic phase receiving tank (6). Compared with the prior art, the invention improves the collection rate, realizes continuous discharge, reduces the labor intensity of workers, improves the working environment on site, and reduces the amount of waste water produced.