A connector comprises a first terminal block and a second terminal block. One side wall of the first terminal block is provided with a boss on which at least one connecting hole is arranged. One side wall of the second terminal block is provided with a recessed trough which cooperates with the boss. At least one connecting column which cooperates with the connecting hole is arranged in the recessed trough. The technical effects of the connector in some illustrative embodiments comprise a capability of realizing line connection precisely and conveniently. The invention further discloses an air treatment system.