Door lock

A door lock, adapted for being assembled on a door sheet, wherein the door sheet has a first surface, a second surface, a lateral margin, an assembling hole penetrating the first surface and the second surface, and a latch slot concavely arranged on the lateral margin, wherein the latch slot is connected and communicated with the assembling hole, wherein said door lock comprises:

• a latch, assembled in the latch slot and extended into the assembling hole and has a core lock hole and two guide holes;
• a first locking mechanism, adapted for being assembled in the assembling hole from the first surface of the door sheet, and comprising an outer lock member, a linkage bar pivoted on said outer lock member, two guide bars extended from said outer lock member, an upper engaging member and a lower engaging member respectively protrudingly arranged from said outer lock member, and a buckle member, wherein said linkage bar is adapted to penetrate said core lock hole, wherein said guide bars respectively pass through said guide holes, wherein said upper engaging member has a first upper engaging portion, wherein said lower engaging member has a first lower engaging portion, wherein said first upper engaging portion and said first lower engaging portion are opposite arranged in a top and bottom manner, wherein said buckle member has a pipe and a bulge protruded from the inside of said pipe;
• and
• a second locking mechanism, arranged on the second surface of the door sheet and comprising an inner cover, a rotating member penetrating said inner cover to connect with said linkage bar, a turning member pivotally arranged on said inner cover, a spiral resilient member connected with said turning member, and an engaging member arranged on said inner cover, wherein said spiral resilient member is arranged in said pipe in a penetrating manner and adapted to be driven by said turning member to screw and abut against said bulge, wherein said engaging member has an upper engaging section and a lower engaging section arranged in parallel and up and down manner with each other, and respectively abut and contact with said first upper engaging portion and said first lower engaging portion.