The effects of density, resin content and hot-pressing temperature on mechanical properties of reconsolidated square material of cotton stalk were investigated by single factor test. The result showed that modulus of elasticity, bending strength and compression strength of cotton stalk reconsolidated square material gradually increased with the increase of density (0.5g/cm3, 0.6g/cm3 and 0.7g/cm3) and resin content (8％, 10％ and 12％) during the range of experiment. With the hot-pressing temperature rising, these mechanical properties increased initially（from 160℃ to 180℃）and then decreased (from 180℃ to 200℃). At other technology condition being equal, the mechanical properties of cotton stalk reconsolidated square material used phenol-formaldehyde (PF) were obviously superior to those used the melamine modified urea-formaldehyde (MUF). The mechanical properties of cotton stalk reconsolidated square material with density of 0.7g/cm3 could be equivalent to mature wood of plantation grown poplar.