The invention relates to a connecting block used in a plurality of detonation transfer systems, in particular to a connecting block used in a detonation transfer system. The connecting block is characterized in that the body (4) of the connecting block is provided with a detonation transfer passage (1) and more than two passive detonation transfer passages I (5); detonation transfer components (2) inside the detonation transfer passage (1) are connected with a plurality of plastic detonators (6) inside the passive detonation transfer passages I (5); the detonation transfer components (2) are fixed inside the detonation transfer passage (1) as input ends, while other plastic detonators (6) fixed inside the passive detonation transfer passages I (5) are used as output ends; moreover, the detonation transfer passage (1) and the passive detonation transfer passages I (5) are communicated with a common cavity (7); and the passive detonation transfer passages I (5) are fixed with the plastic detonators (6) so as to establish signal transmission relation between the detonation transfer components (2) of the detonation transfer passage and the plastic detonators (6). Therefore, a detonation transfer system can obtain excellent safety and high reliability.