The invention discloses a wire connection device with a password locking mechanism. The wire connection device comprises a wiring post, wherein the wiring post is provided with a wire winding hole; the wiring post is further provided with a wiring notch; the connection device further comprises a password locking mechanism; the password locking mechanism comprises a sleeve which sleeves the wiring post and can rotate around the wiring post; the sleeve is provided with a wire through hole corresponding to the wire winding hole; a sleeve notch corresponding to the wiring notch is formed in the upper part of the sleeve; at least three password rings sleeve the outer surface of the sleeve along the axis direction in parallel; each password ring can rotate relative to the sleeve; a password ring notch corresponding to the sleeve notch is formed in the inner wall of each password ring; a locking pin is arranged in the sleeve notch; and a lower cover sleeves the wiring post. With the adoption of the wire connection device with the password locking mechanism, an electric wire can be effectively prevented from sliding off from the wiring post so that the connection performance and safety performance of the electric wire are improved.