The invention relates to a shipborne method for preparing an 
organic fertilizer and coproducing an antibacterial 
building material by using 
sludge. The method comprises the following steps: exploring,designing and sucking 
sludge, carrying out primary 
solid-liquid separation to lower the 
water content to 80% or below, stirring, carrying out air floatation to separate 
heavy metals, organic mattersand mud sand, sucking the organic matters from the upper layer of a separation tank, and carrying out 
fermentation compounding to obtain the 
organic fertilizer. The 
silt sediment is dehydrated for thesecond time to enable the 
water content to reach 20%-50%, the special cementing material is added according to 5%-30% of the 
silt dry basis, and the building block, the water permeable 
brick and thebuilding antibacterial 
building material with the antibacterial function can be obtained through stirring and forming. According to the technical method, 
land acquisition is not needed, secondary 
pollution is avoided, the method is 
environmentally friendly, the developed antibacterial 
veneer board is particularly suitable for public places of high-
risk groups and sterile wards, food factories, pharmaceutical factories and high-end residences of the public places in a wide range, and good news is brought to health of people.