Hypophthalmichthys moritrix was used to study the key components of a pinch-feeding device for dissecting freshwater fish body to solve the problems of single-machine operation and low efficiency of processing in terms of the current device for dissecting freshwater fish body mainly relying on manual feeding，which cannot meet the requirements for mechanized and automated dissection of fish body.A pinch-feeding device for dissecting Hypophthalmichthys moritrix body was developed and tested.The pinch-feeding device for dissecting Hypophthalmichthys moritrix body was consisted of a frame，a fish body feeding component，a fish body pinching component，a fish body dissecting component，and a cleaning component.The minimum limiting pressure of the fish body was obtained by conducting compression tests on the fish body.The conditions of satisfying the process of pinching and feeding，and the magnitude of the force exerted on the fish by different rotation directions of the knife discs were studied by analyzing the force in the process of pinching and dissecting the fish body.A single factor experiment using the acceptability score and cutting loss rate of Hypophthalmichthys moritrix as evaluation indexes was conducted to study the effect of factors including the initial spacing of pinching rollers，the height and speed of the cutting disc on dissecting Hypophthalmichthys moritrix.The results of the orthogonal experiment showed that the factors affecting the effect of dissecting fish body was in the decreasing order of speed of the cutting disc > height of the cutting disc > initial spacing of pinching rollers.When the initial spacing of pinching rollers，the height of the cutting disc，and the speed of the cutting disc was 20 mm，135 mm，and 1 400 r/min，the profile of Hypophthalmichthys moritrix body was smooth and the integrity of the fish meat was high，with the average acceptability score of 9.48，the cutting loss rate of 0.11%，and the efficiency of processing up to 8.0 pieces/min.It will provide a reference for developing the device for dissecting bulk freshwater fish body and designing the automated pre-treatment processing line for freshwater fish.