An embedded tank, comprising: a tank body; and a support frame; wherein the support frame is configured to bear the tank body; a guard plate is provided outside the support frame, and fits the support frame; each of two sides of a first end of the tank body is provided with a boss structure; a counterflow generator is arranged between two boss structures; a first installation space is provided between one of the two boss structures and the support frame, and a second installation space is provided between the other of the two boss structures and the support frame; the first installation space is provided with a first returned water-filtering system and a hydraulic waterproof assembly; and the second installation space is provided with a second returned water-filtering system and an electrical waterproof assembly; the hydraulic waterproof assembly comprises a hydraulic operation unit, a hydraulic waterproof box and a hydraulic waterproof support; the hydraulic waterproof box and the hydraulic waterproof support are configured to bear the hydraulic operation unit; the electrical waterproof assembly comprises an electrical waterproof support and an electrical waterproof box; the electrical waterproof support and the electrical waterproof box are configured to bear a water disinfection system, an electronic control system, a frequency conversion system and a circulating water pump; the hydraulic operation unit is connected with the counterflow generator through a hydraulic oil pipe; and the counterflow generator is communicated with an interior of the tank body; and the first returned water-filtering system and the second returned water-filtering system are connected with the circulating water pump through a water return pipe; the circulating water pump is connected with the electronic control system through a circulating pipe; the electronic control system is connected with the interior of the tank body through an outlet pipe; the water disinfection system is connected with the outlet pipe through a disinfection pipe; and the frequency conversion system is in electric connection with the electronic control system; characterized in that a bottom surface of the electrical waterproof box and a bottom surface of the hydraulic waterproof box are each provided with a drainage chamber; the bottom surface of the electrical waterproof box and the bottom surface of the hydraulic waterproof box are configured to incline toward the drainage chamber; and the drainage chamber is provided with a water outlet; and a box body of the electrical waterproof box is provided with a first fitting groove, and a box body of the hydraulic waterproof box is provided with a second fitting groove; and the electrical waterproof support fits the first fitting groove, and the hydraulic waterproof support fits the second fitting groove. a tank body; and a support frame; wherein the support frame is configured to bear the tank body; a guard plate is provided outside the support frame, and fits the support frame; each of two sides of a first end of the tank body is provided with a boss structure; a counterflow generator is arranged between two boss structures; a first installation space is provided between one of the two boss structures and the support frame, and a second installation space is provided between the other of the two boss structures and the support frame; the first installation space is provided with a first returned water-filtering system and a hydraulic waterproof assembly; and the second installation space is provided with a second returned water-filtering system and an electrical waterproof assembly; the hydraulic waterproof assembly comprises a hydraulic operation unit, a hydraulic waterproof box and a hydraulic waterproof support; the hydraulic waterproof box and the hydraulic waterproof support are configured to bear the hydraulic operation unit; the electrical waterproof assembly comprises an electrical waterproof support and an electrical waterproof box; the electrical waterproof support and the electrical waterproof box are configured to bear a water disinfection system, an electronic control system, a frequency conversion system and a circulating water pump; the hydraulic operation unit is connected with the counterflow generator through a hydraulic oil pipe; and the counterflow generator is communicated with an interior of the tank body; and the first returned water-filtering system and the second returned water-filtering system are connected with the circulating water pump through a water return pipe; the circulating water pump is connected with the electronic control system through a circulating pipe; the electronic control system is connected with the interior of the tank body through an outlet pipe; the water disinfection system is connected with the outlet pipe through a disinfection pipe; and the frequency conversion system is in electric connection with the electronic control system; characterized in that a bottom surface of the electrical waterproof box and a bottom surface of the hydraulic waterproof box are each provided with a drainage chamber; the bottom surface of the electrical waterproof box and the bottom surface of the hydraulic waterproof box are configured to incline toward the drainage chamber; and the drainage chamber is provided with a water outlet; and a box body of the electrical waterproof box is provided with a first fitting groove, and a box body of the hydraulic waterproof box is provided with a second fitting groove; and the electrical waterproof support fits the first fitting groove, and the hydraulic waterproof support fits the second fitting groove.