The utility model relates to a C cross -section spring catch assembly and disassembly tools that appears, this instrument include L shape support, work arm and motion arm, the top of L shape support pass through rivet AND operation arm swing joint, the bottom of L shape support be equipped with the round hole, the inboard of L shape frame be equipped with the sub -arm, the end of sub -arm be equipped with the locating hole, the motion arm on be equipped with the slot hole, upper end and the slot hole of work arm pass through rivet swing joint, the work arm pass the locating hole, the lower extreme of work arm be connected with the mould subassembly through the internal thread, through the utility model discloses an instrument is installed and removed to the spring catch, can solve in the past the problem that the difficulty was dismantled in the spring catch installation, not only very big reduction intensity of labour, has improved the technological level in addition and has increased labor efficiency.