Window slat cutting device

A slat cutting device comprising:

• a positioning unit having two parallel side boards, a back board connected between two side boards, a reception recess defined between the two parallel side boards and the back board, and
• a cutting unit having an operation board located horizontally, the operation board having a first end and a second end, two guide boards perpendicularly connected to two sides of the second end of the operation board, a space defined between the two guide boards, each guide board having a longitudinal cutting slit defined therethrough and communicating a top of the guide board, an anvil located between the two guide boards and on the second end of the operation board, the anvil being not intersecting the two cutting slits, the space located corresponding to the reception recess, two ends of slats respectively accommodated in the reception recess and the space, the slats contacting the back board, and
• a blade movably extending through the cutting slits to cut the slats.