A position adjustment mechanism for a lifting balance device contains: a first cover and an adjustment device. The first cover includes at least one lifting balance device, and each of the at least one lifting balance device includes a first support, a second support intersected with the first support, and a first shaft configured to connected the first and second supports. The first support includes a first roller arranged on a first end thereof adjacent to the first cover and accommodated in a first track groove on the first cover. The first track groove has the adjustment device arranged therein opposite to the first roller, such that the adjustment device is adjustable to limit a highest lifting position of each of the first support and the second support.