A mounting mechanism for gripping DIN rail comprises: a main body and a latching body. The main body includes a first mounting portion having a stopper member and at least one first retaining unit, and a second mounting portion. The latching portion is movably disposed in the first mounting portion and includes at least one resilient portion and at least one second retaining unit. When one end of the latching body protrudes into the second mounting portion, the range of movement of the latching body spans from a position wherein the resilient portion abuts the stopper member to a position in wherein the second retaining unit abuts the first retaining unit. The main body is movably latched onto the DIN rail through the second mounting portion, and is fixed to a position on the DIN rail through one end of the latching body protruding into the second mounting portion.