The invention discloses a multi-frequency plane printed antenna comprising a protruded floor and applied to a mobile terminal and belongs to the technical field of mobile terminal antennas. The multi-frequency plane printed antenna is characterized in that two resonance structures, namely a simulation branch and a parasitism land branch are utilized to select and combine all resonance modes which are simulated so as to obtain broadband and multi-frequency characteristics. A coaxial probe feeding manner is utilized to improve the reliability of test results, and impedance matching is performed by loading an adjusting piece. In addition, with the protruded floor structure, under the condition that acceptable antenna performance is ensured, placing spaces are provided for electronic equipment such as a camera, a loudspeaker, a data interface, a power supply and an earphone interface, wherein the electronic equipment possibly needs to be placed. The area of a clearance zone occupied by the multi-frequency plane printed antenna on a circuit board is only 15mm*28.3mm, a -6dB impedance bandwidth of the multi-frequency plane printed antenna can effectively cover work frequency bands of GSM 850, GSM 900, DCS, PCS, UMTS, LTE 2300, 2.4-GHz WLAN, LTE 2500 and the like.