The invention discloses a self-locking and angle-adjustable sling lamp. The self-locking and angle-adjustable sling lamp comprises a lamp body and a support; a connection rod is arranged on the top of the lamp body; the end portion, stretching into the support, of the connection rod is provided with a bulb; the upper portion of the support is provided with a cover plate used for locking the bulb; the two ends of the support are each fixedly provided with an installing plate; the tops of the installing plates are bent downwards to form hook parts; a plate body located on one side of each hook part is provided with a bolt hole, and a plate body on the opposite side of each hook part is provided with a groove; each hook part is provided with a locking bolt arranged in the bolt hole and the groove in a penetrating manner; and each locking bolt is sleeved with a fastening nut after penetrating the corresponding groove. The self-locking and angle-adjustable sling lamp is simple in structure and convenient to install; the lighting angle of the lamp can be adjusted according to the practical installing requirement, and better practicability is achieved; and the fastening nuts are tightened so that the hook parts can clamp a rope, the self-locking function is achieved, and displacement of the lamp is avoided.