The invention discloses an opening-type and blocking-prevention pressure sensor and a washing machine and electric cooker with the same. The pressure sensor comprises a hollow-structure base, an uppercover, a film, a magnet seat, a spring and a Hall PCB assembly, wherein the upper cover is arranged at a side circumference of an upper part of the base, the film is arranged at an upper end of the base and covers the base, the magnet seat is arranged in the base, a part, extending to the periphery, of the film is fixedly arranged on the upper cover, the spring sleeves the periphery of the magnetseat, a lower end of the spring is fixedly arranged in the base, an upper end of the spring is fixedly connected with the magnet seat, a magnet is fixedly arranged at a lower part of the magnet seat,the Hall PCB assembly is arranged near to the magnet, so that the film is deformed towards an internal direction of the base under an external pressure effect, and an output voltage signal of a Hallcomponent in the Hall PCB assembly can be further changed by the magnet when the spring is compressed by the magnetic to drive the magnet to move downwards. An opening-type structure of which the filmis in direct contact with external moisture is employed, the blocking of the sensor is effectively prevented, and the application range is expanded.