In order to research Dense Plasma Focus device (DPF), a kind of scintillation neutron detector is introduced in this paper. The detector consists of a ST401-plastic scintillation and a XP2262B-photoelectric electron-multiplier tube. With a silver activation detector, the DT neutron sensitivity of the scintillation detector is calibrated as 0.022 5 pC per neutron, the neutron yield measurement range is from 109 to 1011 per pulse.