The invention discloses a modular spring operation mechanism separating-brake half-shaft tripping device characterized in that the device comprises a half shaft (1) and a shaft (8) which sequentially and separately go through a mechanism left side plate (9) and a mechanism right side plate (10) which are arranged in an opposite mode; the half shaft (1) and the shaft (8) are mutually arranged in parallel and the shaft (8) is arranged below the half shaft (1); a shaft sleeve (4) sleeves the shaft (8) between the mechanism left side plate (9) and the mechanism right side plate (10); a bearing (7) sleeves the shaft sleeve (4); a four-hole connecting plate (3) sleeves the bearing (7); and the four-hole connecting plate (3) is connected to the bottom end of a closing pinch plate (6) in a vertical direction. The modular spring operation mechanism separating-brake half-shaft tripping device provided by the invention is simple in structure, can effectively absorb an impact force in closing, reduces impact to the half-shaft by the closing pinch plate in the closing; the usage life is long; and the reliability is high.