Underground water pollution detection device

The utility model provides an underground water pollution detection device which comprises an arc-shaped groove and a box body which is installed at the bottom in the arc-shaped groove, used for storing water and provided with a PH sensor and an ORP sensor, an annular pipe is arranged on the upper portion in the arc-shaped groove, and a one-way valve communicated with the annular pipe is installed on the outer surface of the annular pipe. The one-way valve is connected with the air outlet end of an air pump through a pipe connector, the air pump is installed at the bottom in the arc-shaped groove, a plurality of vertically-arranged branch pipes are evenly installed on the lower portion of the outer surface of the annular pipe, the lower ends of the branch pipes penetrate through the arc-shaped groove and are provided with expansion air bags, and a first electromagnetic valve is installed on the upper portion of the outer surface of the annular pipe. Compared with the prior art, the arc-shaped groove has the a