The invention discloses a non-fixed waterproof radioactive safety check door. The door comprises a left door body, a right door body, a cross beam and a detection device; the two ends of the cross beam are connected to the left door body and the right door body through bolts respectively; the left door body comprises a left door body hollow stand column, a left door body sealing plate and a left door body base; the right door body comprises a right door body hollow stand column, a right door body sealing plate and a right door body base; each of the left door body sealing plate and the right door body sealing plate comprises a PC/ABS composite board and a strip-shaped metal framework; the PC/ABS composite board is embedded in the strip-shaped metal framework; the edges of the openings of the left door body hollow stand column and the right door body hollow stand column adopt L-shaped bent edge structures; sealing rubber strips are arranged on the L-shaped bent edge structures; and thePC/ABS composite boards are integrally installed on the openings of the left door body hollow stand column and the right door body hollow stand column through the strip-shaped metal frameworks by using screws, and are in contact compression with the corresponding sealing rubber strips. According to the door, the non-fixed installation of the whole machine can be realized, and the waterproof requirements of IP65 can be met.