The invention discloses a built-in 
magnetic separation filter pressing dehydrator which is used for equipment for separating, concentrating and dehydrating magnetic 
slag water or water-containing magnetic materials. The built-in 
magnetic separation filter pressing dehydrator comprises a rack, a motor reducing gear, a coupler, a bearing block, an outer groove, a magnetic cylinder of which the 
magnetic field transmits inward, an inner groove, compression rollers, a 
slag scraping plate, a 
slag conveying belt, a material inlet, a drainage 
pipe and the like; the built-in 
magnetic separation filterpressing dehydrator is characterized in that: a filter pressing cylinder is arranged in the magnetic cylinder, and the 
magnetic field transmits inward. The built-in magnetic separation filter pressing dehydrator effectively solves the problem that press water and subsequent slag are mixed and saturated, and realizes multi-level pressing on one magnetic cylinder, and tapped slag is low in moisturecontent; and the equipment is high in resistance to 
impact load, and 
pollution to the field, which is caused by overflowing during change of the slag water amount can be avoided. The technical schemeand the equipment can be widely applied to separating, concentrating and dehydrating of water-containing magnetic slag or magnetic materials in the fields of 
metallurgy, 
machining, ore concentration and the like, the tapped slag is low in 
moisture content, and the built-in magnetic separation filter pressing dehydrator saves investment, occupies small floor, and can run at low consumption.