The invention relates to sludge dehydrating equipment and dehydrating method. The sludge dehydrating equipment comprises a sludge storage container, a stereoscopic dehydrating assembly mounted in the sludge storage container, a pressurizing plate which is arranged above the stereoscopic dehydrating assembly and can move up and down and a driving assembly used for driving the pressurizing plate to move up and down and providing pressure for the pressurizing plate, wherein the stereoscopic dehydrating assembly comprises a lower permeable plate positioned at the lower part of the sludge storage container, an upper permeable plate arranged above the lower permeable plate and detachably connected with the pressurizing plate and a plurality of water draining components which are connected between the lower permeable plate and the upper permeable plate and extend in a vertical direction, and at least one side wall of the sludge storage container can be opened and closed. As the stereoscopic dehydrating assembly is arranged into the corresponding lower permeable plate and upper permeable plate, and the water draining components are connected between the lower permeable plate and the upper permeable plate, the water draining channels of sludge are increased, the pressurizing plate is pressurized through the driving assembly, and the sludge is deep dehydrated.