A mounting device includes a securing clamp (101), a mounting plate (102), an adapter plate (103) and connectors (104), wherein the securing clamp (101) is provided with at least one mounting hole (1014) at each of two ends of the securing clamp (101) respectively, the connectors (104) mount the securing clamp (101) to a fixed surface through the mounting holes (1014), an equipment mounting surface of the securing clamp (101) is provided with a mounting plate connection device (1011), the mounting plate (102) is connected to the securing clamp (101) through the mounting plate connection device (1011), an equipment connection device (1022) used for securing equipment is provided on the mounting plate (102), the securing clamp (101) is provided with an adapter plate mounting device (1012), used for securing an adapter plate (103), at each of two lateral sides of the securing clamp (101). The mounting device can be expanded to accommodate the mounting of a plurality of devices.