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When you lift a box from the floor and p...

When you lift a box from the floor and put it one an almirah the ptotential energy of the box increases, but thre is no change in its kinetic energy. Is it a violation of consevation of energy?

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No, it is not violation of conservation of energy. In fact, the work done by the force we apply and the work done by gravitational pull are equal and opposite and hence no net work is done on the body. Hence, no net change in kinetic energy. However, it can be viewed as the work done by us against the gravitational pull is stored in it as its polential energy.
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