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1. A head-mounted display device, comprising: a body having two zoom lens groups corresponding to both eyes; and two adjustment modules configured to be assembled to the two zoom lens groups, wherein each of the two adjustment modules comprises: a base; a sliding block having an actuating end, a braking end, and a transmission end; a first shape memory alloy element connected between the base and the actuating end and configured to actuate the sliding block so that the transmission end drives the corresponding zoom lens group of the two lens groups to zoom; a first recovery element connected between the base and the actuating end and configured to keep the sliding block at an original position when the first shape memory alloy element is in a power-off state; a braking element engaged with the braking end when the braking element is in a braking position and separated from the braking end when the braking element is in a movable position; a second shape memory alloy element connected between the base and the braking element and configured to actuate the braking element to move between the braking position and the movable position; and a second recovery element connected between the base and the braking element and configured to keep the braking element at the braking position or the movable position when the second shape memory alloy element is in the power-off state.
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