Portable neutron detection device

The invention relates to a portable neutron detection device. The device comprises an outer sleeve (2), as well as a neutron scintillator conversion screen (5), a photoconductive material (6), an end window photomultiplier (7) and a base (3) which are sequentially arranged in the outer sleeve (2) and are in compression fitting joint, wherein an output port (4) extruding at the outer end of the base (3) is formed at one end of the end window photomultiplier (7), and connected with a preamplifier (9), a main amplifier (10) and a multi-channel analyzer (11) in sequence through leads; a screwable protective cover (1) with an inner thread is arranged at the front end of the outer sleeve (2); the protective cover (1) and the outer sleeve (2) are made of an aluminum material; the screwing progress can be adjusted by rotating the protective cover (1); and a magnetic shielding material (8) is coated on the outer surface of the end window photomultiplier (7). The portable neutron detection device can effectively shield an outer optical signal, has high efficiency in neutron detection, and is simple in structure and convenient to carry.