The utility model provides a water leakage measuring device of packing of a water injection pump. The water leakage measuring device is characterized in that the water leakage measuring device comprises a barrel body, a water outlet is formed in the lower portion of the barrel body, the water outlet is connected with a throttling valve, a barrel cover is arranged on the barrel body, and a water inlet is formed in the barrel cover. An upper shield is fixed to the upper portion the barrel cover, the top of the upper shield is provided with an aviation connector, a lower shield provided with a through hole is fixed to the lower portion of the barrel cover, a magnetic float switch is arranged in the lower shield, and the signal output end of the magnetic float switch is connected with the aviation connector. The water leakage measuring device enables workers to know the water leakage condition of the packing of the water injection pump remotely in real time so that the workers can conduct remote monitoring and take subsequent measures, and therefore economic losses caused due to the facts that water leakage of the water injection pump increases sharply, water leaked from the packing of the water injection pump enters a crankcase of the water injection pump along a connecting rod of the water injection pump, and engine oil in the crankcase of the water injection pump is emulsified are avoided.