Device for measuring internal humidity of concrete

The utility model relates to a device for measuring internal humidity of concrete, which comprises a pre-embedded box (1), a mounting sleeve (4), a mounting support rod (2) and a plugging piston rod (6), the mounting support rod (2) is fixed on the pre-embedded box (1) and used for being connected with a main reinforcement of an internal structure of the concrete, one end of the mounting sleeve (4) penetrates into the pre-embedded box (1) and is fixedly connected with the pre-embedded box (1), and the other end of the mounting sleeve (4) is fixedly connected with a mounting sleeve end head (5). The plugging piston rod (6) penetrates into the mounting sleeve (4) from the embedded box (1) and penetrates through the whole length of the mounting sleeve (4), external threads are arranged at the end of the plugging piston rod (6), internal threads are arranged at the end of the mounting sleeve (4), and the plugging piston rod (6) is connected with the mounting sleeve (4) through the threads. The device can be pre-b