The invention discloses a slaughtering and processing device and slaughtering and processing method for chilled chicken. The method comprises the following steps: manually fixing chicken on a hook ofa conveying device; sending the hung chicken into a stunning and killing device through the hook and the conveying device for welfare slaughtering, draining blood after slaughtering, and then performing soaking, scalding and unhairing, and sending the treated chicken into a first cleaning tank for cleaning; performing evisceration to remove internal organs after cleaning, and then performing cleaning again; and sending the chicken into a bone removing device to remove the head and feet after cleaning, sending the chicken into a cooling tank for pre-cooling, and sending the chicken into a low-temperature freezing box after per-cooling. The slaughtering and processing method is clean and rapid, ensures sanitation of slaughtering sites, reduces bacterial colony on the chicken, and avoids chicken taste deterioration caused by the huge change from the high temperature for unhairing to the freezing temperature, breeding of bacteria is prevented by a plasma electrostatic field, and the purpose of continuous insurance is achieved. Moreover, juice loss and surface browning are avoided, quality is ensured, the shelf life is prolonged, and the slaughtering and processing method has wide applicability in the field of chicken processing.