A mounting apparatus includes a bracket defining at least one clamping hole, a receiving rack, and a latching unit pivotally mounted to the receiving rack. The latching unit includes a fitting member, a locking member pivotally mounted to the fitting member, a contact member slidably attached to the fitting member, and a first resilient member resisting the contact member and the locking member. A latching block extends from the locking member to latch with the receiving rack. The contact member includes at least one latching tab and a pushrod opposite to the latching tab. When the latching tab is moved to deform the first resilient member, the pushrod rotates the locking member, resulting in the latching block disengaging from the receiving rack. Elasticity of the first resilient member engages the latching tab in the clamping hole.