Door and window detecting levels for building engineering quality supervision

The invention relates to the technical field of measuring devices, and discloses door and window detecting levels for building engineering quality supervision. The levels comprise a folding connectingpiece, a telescopic plate and a first level, wherein the right side surface of the folding connecting piece is fixedly connected with a connecting plate, a sliding cavity is defined in the connectingplate, a latching seat is fixedly connected to the left side of the first level, and the latching seat is slidably connected to the inner portion of the sliding cavity. The door and window detectionlevels for building engineering quality supervision enable the first level and the second level to maintain a horizontal state when being extended by the connection of the joint node, the support plate and the support bolt to avoid the inclination that causes errors in the measurement result, enable folding when not used by the folding connecting piece, enable convenient carrying, and enable the first level to be removed fr