The utility model relates to an oil feeder, in particular to a monitorable transmitting-type rationing electromagnetic oil feeder which solves the problems that the prior electromagnetic oil feeders are wasting in time and labor, bad in reliability, heavy, large in size, easy to damage and the like. The monitorable transmitting-type rationing electromagnetic oil feeder comprises a valve block, a main piston, an upper piston cavity and a lower piston cavity. The valve block is provided with an oil inlet, an upper oil outlet and a lower oil outlet, a two-position-three-way magnetic valve is arranged on the valve block, a vertical export oil duct, an upper traversal controlled oil duct and a lower traversal controlled oil duct are arranged in the valve block, the upper traversal controlled oil duct is communicated with the upper piston cavity, the lower traversal controlled oil duct is communicated with the vertical export oil duct and the lower piston cavity, and a reset spring is sleeved on a non-magnetizer piston rod. The monitorable transmitting-type rationing electromagnetic oil feeder has the advantages that structure is reasonable, reliability is high, lubricating condition of friction pairs is monitored accurately, service lives of the oil feeder and the friction pairs are prolonged, consumption and maintenance cost of lubricating oil are reduced, and application range is wide.